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t in (-oo:+oo)
3*t+5*t-(3/7) = -115/7 // + -115/7
3*t+5*t-(3/7)-(-115/7) = 0
3*t+5*t-3/7+115/7 = 0
8*t+16 = 0 // - 16
8*t = -16 // : 8
t = -16/8
t = -2
t = -2
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