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x=0
b)3x-5x=4
-2x=4 I: -2
x=-2
c) -2x-7x=18
-9x=18 I: -9
x=-2
d)6x-2x=-4
4x=-4 I:4
x=-1
e)-2x-6x=-9-7
-8x=-16 I: -8
x=2
f) -4x+9x=25-5
5x=20 I:5
x=4
B.
C.
D.
E.
F.