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t in (-oo:+oo)
3-t = -5*t-45 // + -5*t-45
3-t-(-5*t)+45 = 0
5*t-t+3+45 = 0
4*t+48 = 0 // - 48
4*t = -48 // : 4
t = -48/4
t = -12
t = -12
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