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t in (-oo:+oo)
5*t+10 = 2*t-11 // - 2*t-11
5*t-(2*t)+10+11 = 0
5*t-2*t+10+11 = 0
3*t+21 = 0 // - 21
3*t = -21 // : 3
t = -21/3
t = -7
t = -7
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