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x in (-oo:+oo)
2*((1/2)*x-2) = x-4 // - x-4
2*((1/2)*x-2)-x+4 = 0
2*(1/2*x-2)-x+4 = 0
2*(1/2*x-2)-x+4 = 0
4-4 = 0
0 = 0
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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