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t in (-oo:+oo)
2*t-(5*t)-6 = 30 // - 30
2*t-(5*t)-30-6 = 0
2*t-5*t-30-6 = 0
-3*t-36 = 0 // + 36
-3*t = 36 // : -3
t = 36/(-3)
t = -12
t = -12
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