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t in (-oo:+oo)
-75 = 7*t+2*t-3 // - 7*t+2*t-3
3-(7*t)-(2*t)-75 = 0
3-7*t-2*t-75 = 0
-9*t-72 = 0 // + 72
-9*t = 72 // : -9
t = 72/(-9)
t = -8
t = -8
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