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za y podstawiasz 0
a)0=3x-3
3x=3/:3
x=1
b)0=-2x+4
2x=4/:2
x=2
c)0=1/2x-3
1/2x=3/*2
x=6
d)0=4x+2
4x=-2/:4
x=-1/2
e)0=-3x-6
3x=-6/:3
x=-2
f)0=-5x=-5