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t in (-oo:+oo)
7 = (3/5)*t-2 // - (3/5)*t-2
2-((3/5)*t)+7 = 0
(-3/5)*t+2+7 = 0
9-3/5*t = 0 // - 9
-3/5*t = -9 // : -3/5
t = -9/(-3/5)
t = 15
t = 15
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