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t in (-oo:+oo)
7*t-((1/2)*t)-3 = 36 // - 36
7*t-((1/2)*t)-36-3 = 0
(-1/2)*t+7*t-36-3 = 0
13/2*t-39 = 0 // + 39
13/2*t = 39 // : 13/2
t = 39/13/2
t = 6
t = 6
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