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t in (-oo:+oo)
7*(2*t+2) = -126 // + 126
7*(2*t+2)+126 = 0
7*(2*t+2)+126 = 0
14*t+140 = 0
14*t+140 = 0
14*t+140 = 0 // - 140
14*t = -140 // : 14
t = -140/14
t = -10
t = -10
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