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x in (-oo:+oo)
W = 3*t+(7/2)*t // - 3*t+(7/2)*t
W-(3*t)-((7/2)*t) = 0
W-3*t+(-7/2)*t = 0
W-13/2*t = 0
x naleu017Cy do R
x in (-oo:+oo)
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