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t in (-oo:+oo)
5*(3*t-7) = 100 // - 100
5*(3*t-7)-100 = 0
5*(3*t-7)-100 = 0
15*t-135 = 0
15*t-135 = 0
15*t-135 = 0 // + 135
15*t = 135 // : 15
t = 135/15
t = 9
t = 9
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