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t in (-oo:+oo)
5*(2*t+9) = 135 // - 135
5*(2*t+9)-135 = 0
5*(2*t+9)-135 = 0
10*t-90 = 0
10*t-90 = 0
10*t-90 = 0 // + 90
10*t = 90 // : 10
t = 90/10
t = 9
t = 9
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