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t in (-oo:+oo)
2*(5*t+7) = -56 // + 56
2*(5*t+7)+56 = 0
2*(5*t+7)+56 = 0
10*t+70 = 0
10*t+70 = 0
10*t+70 = 0 // - 70
10*t = -70 // : 10
t = -70/10
t = -7
t = -7
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