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t in (-oo:+oo)
2*(5*t+6) = -18 // + 18
2*(5*t+6)+18 = 0
2*(5*t+6)+18 = 0
10*t+30 = 0
10*t+30 = 0
10*t+30 = 0 // - 30
10*t = -30 // : 10
t = -30/10
t = -3
t = -3
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