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t in (-oo:+oo)
7*(3*t+5) = -70 // + 70
7*(3*t+5)+70 = 0
7*(3*t+5)+70 = 0
21*t+105 = 0
21*t+105 = 0
21*t+105 = 0 // - 105
21*t = -105 // : 21
t = -105/21
t = -5
t = -5
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