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x in (-oo:+oo)
x-(3*((1/3)*x-2)) = 6 // - 6
x-(3*((1/3)*x-2))-6 = 0
x-3*((1/3)*x-2)-6 = 0
x-3*(1/3*x-2)-6 = 0
x-3*(1/3*x-2)-6 = 0
6-6 = 0
0 = 0
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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