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4x=(32+x)-(2x+28)
to jest równość bo ma znak =
4x=32+x-2x-28
4x-x+2x=32-28
5x=4
x=4/5
4x=32+x-2x-28
4x-x+2x=4
5x=4/:5
x=4/5
32-28=2x-x
4=x