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a)1/x=1
1=1
b)1-x=2*(1/2-1/2x)
1-x=1-1x
-x+1x=-1+1
0=0-Tożsamość
c)-5x=100x/:(-5)
x=-20
d)2(x-4)=2x-4
2x-8=2x-4
2x-2x=8-4
0=4