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x in (-oo:+oo)
12*R = (1/4)*M-5 // - (1/4)*M-5
12*R-((1/4)*M)+5 = 0
(-1/4)*M+12*R+5 = 0
12*R-1/4*M+5 = 0
x należy do R
x in (-oo:+oo)
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