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x in (-oo:+oo)
P = (7/6)*M+20 // - (7/6)*M+20
P-((7/6)*M)-20 = 0
(-7/6)*M+P-20 = 0
P-7/6*M-20 = 0
x naleu017Cy do R
x in (-oo:+oo)
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