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t in (-oo:+oo)
7*t+(1/6)*t+9 = 151/12 // - 151/12
7*t+(1/6)*t-(151/12)+9 = 0
7*t+(1/6)*t-151/12+9 = 0
43/6*t-43/12 = 0 // + 43/12
43/6*t = 43/12 // : 43/6
t = 43/12/43/6
t = 1/2
t = 1/2
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