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t in (-oo:+oo)
7*t+2*t+7/8 = -427/88 // + -427/88
7*t+2*t+7/8-(-427/88) = 0
7*t+2*t+7/8+427/88 = 0
9*t+63/11 = 0 // - 63/11
9*t = -63/11 // : 9
t = -63/11/9
t = -7/11
t = -7/11
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