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t in (-oo:+oo)
t+7*t+3/10 = 563/10 // - 563/10
t+7*t+3/10-(563/10) = 0
t+7*t+3/10-563/10 = 0
8*t-56 = 0 // + 56
8*t = 56 // : 8
t = 56/8
t = 7
t = 7
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