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t in (-oo:+oo)
6*t+7 = 88-3*t // - 88-3*t
6*t-(-3*t)-88+7 = 0
6*t+3*t-88+7 = 0
9*t-81 = 0 // + 81
9*t = 81 // : 9
t = 81/9
t = 9
t = 9
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