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x in (-oo:+oo)
T = (1/4)*N+40 // - (1/4)*N+40
T-((1/4)*N)-40 = 0
(-1/4)*N+T-40 = 0
T-1/4*N-40 = 0
x naleu017Cy do R
x in (-oo:+oo)
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