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x in (-oo:+oo)
P^-1*w = (1/2)*w-7 // - (1/2)*w-7
P^-1*w-((1/2)*w)+7 = 0
P^-1*w+(-1/2)*w+7 = 0
P^-1*w-1/2*w+7 = 0
x należy do R
x in (-oo:+oo)
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