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t in (-oo:+oo)
3*(4*t+7) = -63 // + 63
3*(4*t+7)+63 = 0
3*(4*t+7)+63 = 0
12*t+84 = 0
12*t+84 = 0
12*t+84 = 0 // - 84
12*t = -84 // : 12
t = -84/12
t = -7
t = -7
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