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t in (-oo:+oo)
3*t+6 = -6*t-57 // + -6*t-57
3*t-(-6*t)+6+57 = 0
3*t+6*t+6+57 = 0
9*t+63 = 0 // - 63
9*t = -63 // : 9
t = -63/9
t = -7
t = -7
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