Răspuns:
Explicație pas cu pas:
a) 9x-63=-63
9x=0
x=0
b) 5x+15=3x-15
2x=-30
x=-15
c) -2x+8=-3x-3+23
x=20-8
x=12
d) 1-2(3-4+x)=-7
1-2(x-1)=-7
1-2x+2=-7
-2x=-7-3
-2x=-10
x=5
e) 2x+12-5+3x=-2x+18+3
5x+7=-2x+21
7x=14
x=2
f) 225=-15(x-3)
225=-15x+45
180=-15x
x=-12
