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-x=-2/(-1)
x=2
b) 3x+3=4x+2
3x-4x=2-3
-x=-1/(-1)
x=1
c) 4x-4x=2-7
0=-5
d) x=8
e) 2x+2x=7-3
4x=4
x=1
-x=-6
x=6
3x+3=4x+2
3x-4x=2-3
-x=-1
x=1
4x-4x=2-7 wynik 0
x=8
2x+2x=7-3
4x=4
x=1