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t in (-oo:+oo)
7*t+8 = 2*t-52 // - 2*t-52
7*t-(2*t)+8+52 = 0
7*t-2*t+8+52 = 0
5*t+60 = 0 // - 60
5*t = -60 // : 5
t = -60/5
t = -12
t = -12
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