Răspuns :
1.a)7x=14+0
x=14
x=14/7
x=2
b)4x=0-12
4x=-12
x=-12/4
x=-3
c)-9x=-27
x=-27/-9
x=3
d)-4x=36
x=36/-4
x=-9
e)2x=-10-4
2x=-14
x=-14/2
x=-7
f)10+4=7x
14=7x
14/7=x
2=x
g)6+2=4x
8=4x
8/4=x
2=x
h)-7-1=4x
-8=4x
-8/4=x
-2=x
i)11-3=2x
8=2x
8/2=x
4=x
j)5x=20
x=20/5
x=4
k)5x=10
x=1-/5
x=2
l)4x=-16
x=-16/4
x=-4
m)5x=15
x=15/5
x=3
n)-6x=-12
x=-12/-6
x-2
o)8x=-8
x=-8/8
x=-1
q)-3x=-9
x=-9/-3
x=3
r)2x=-6
x=-6/2
x=-3
2.a)5x-3x=11+3
2x=14
x=14/2
x=7
b)-2x+3x=9-15
x=-6
c)4x-3x=15-13
x=2
d)-17x+16x=43-9
-x=34
x=-34
1. 7x-5=3x+11
7x-3x=11+5
4x=16⇒ x=16:4=4
2. 3(x-2)+10=x+24
3x-6+10=x+24
2x=24+6- 10=20 ⇒ x=20:2=10
3. 7(x-3)+14=32-6x
7x-21+14=32-6x
7x-7=32-6x
7x+6x=39
13x=39⇒ x=3
4. 7/3-4x=3/5
4x=7/3 -3/5 aducem la ac numitor care este 15
60x=35-9
60x=26⇒ x=26/60=13/30
5.2(x+1)-7(x-3)=3(x+10)+1
2x+2-7x+21=3x+30+1
23- 5x=3x+31
23-31=3x+5x
-8=8x⇒ x= - 1
6. [tex] \frac{x-2}{6} [/tex]-[tex] \frac{2x+13}{8} [/tex]=[tex] \frac{37}{24} [/tex]-[tex] \frac{12+x}{4} [/tex]
Aducem la ac numitor care este 24
4(x-2)-3(2x+13)=37-6(12+x)
4x-8-6x-39=37-72-6x
4x-6x+6x=-35+39+8
4x=12⇒ x=12:4=3
7. 3(x-1)-6=2(x+7)
3x-3-6=2x+14
3x-9=2x+14
3x-2x=14+9
x=23
7x-3x=11+5
4x=16⇒ x=16:4=4
2. 3(x-2)+10=x+24
3x-6+10=x+24
2x=24+6- 10=20 ⇒ x=20:2=10
3. 7(x-3)+14=32-6x
7x-21+14=32-6x
7x-7=32-6x
7x+6x=39
13x=39⇒ x=3
4. 7/3-4x=3/5
4x=7/3 -3/5 aducem la ac numitor care este 15
60x=35-9
60x=26⇒ x=26/60=13/30
5.2(x+1)-7(x-3)=3(x+10)+1
2x+2-7x+21=3x+30+1
23- 5x=3x+31
23-31=3x+5x
-8=8x⇒ x= - 1
6. [tex] \frac{x-2}{6} [/tex]-[tex] \frac{2x+13}{8} [/tex]=[tex] \frac{37}{24} [/tex]-[tex] \frac{12+x}{4} [/tex]
Aducem la ac numitor care este 24
4(x-2)-3(2x+13)=37-6(12+x)
4x-8-6x-39=37-72-6x
4x-6x+6x=-35+39+8
4x=12⇒ x=12:4=3
7. 3(x-1)-6=2(x+7)
3x-3-6=2x+14
3x-9=2x+14
3x-2x=14+9
x=23