a) 2x+8 -5x -15=4x-4+19
-3x -7= 4x +15
-3x-4x =15+7
-7x= 22
x= -22/7
b)12/5 - [1/10 +( -11/5 -x)]=1/5 aducem la acelasi numitor in (...)
-[1/10 +(-11-5x)/5]= 1/5 -12/5
-[1/10 +(-11-5x)/5]= -11/5
1/10 +(-11-5x)/5 = 11/5 aducem la acelasi numitor
1-22-10x =22
-21-10x=22
-10x=22+21
-10x= 43
x= -43/10= -4,3
c)3+(1 -x)/2 = (1/2)² + 75/100
3+ 1-x/2= 1/4 + 3/4 aducem la acelasi numitor
36+12-6x =3 +9
48-6x =12
-6x=12-42
-6x= -30
6x=30
x= 5
