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t in (-oo:+oo)
t-10 = -4*t-55 // + -4*t-55
t-(-4*t)-10+55 = 0
t+4*t-10+55 = 0
5*t+45 = 0 // - 45
5*t = -45 // : 5
t = -45/5
t = -9
t = -9
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