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t in (-oo:+oo)
3*(6*t+3) = -63 // + 63
3*(6*t+3)+63 = 0
3*(6*t+3)+63 = 0
18*t+72 = 0
18*t+72 = 0
18*t+72 = 0 // - 72
18*t = -72 // : 18
t = -72/18
t = -4
t = -4
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