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t in (-oo:+oo)
5*(2*t+7) = 45 // - 45
5*(2*t+7)-45 = 0
5*(2*t+7)-45 = 0
10*t-10 = 0
10*t-10 = 0
10*t-10 = 0 // + 10
10*t = 10 // : 10
t = 10/10
t = 1
t = 1
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