Răspuns:
ex 18:
a)15x-10+3x-48x+78=144-32x-78
15x+68+3x-48x=+66-32x
+68-66=-32x-15x-3x+48x
2=-47x+48x-3x
2+1x-3x
2=-2x\
x=2:(-2)
x=-1
b)
6x+8-10x+15-2=14x-28+16-10x+3x
6x+21-10x=14x-12-10x+3x
21+12=14x-10x+3x-6x+10x
33=4x-3x+10x
33=11x
x=33:11
x=3
c)6x-8+30x-35-3x=9x+90+11x+132+8
6x-43+30x-3x=9x+230+11x
-43-230=9x+11x-6x-30x
-270=20x-36x
-270=-16x
x=-270:(-16)
x=+15
d)
18x-15-8x-6+13=8x-18+2x-15x+10
18x-8-8x=8x-8+2x-15x
-8+8=8x+2x-15x-18x+8x
0=10x-33x+8x
0=-23x+8x
-23x+8x=0
-15x=0
x=0:(-15)
x=0
Explicație jkchgyvjxhfdvbdfjhvdf
