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t in (-oo:+oo)
5*t+9 = 75-6*t // - 75-6*t
5*t-(-6*t)-75+9 = 0
5*t+6*t-75+9 = 0
11*t-66 = 0 // + 66
11*t = 66 // : 11
t = 66/11
t = 6
t = 6
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