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t in (-oo:+oo)
(-3/4)*t+3/5 = -69/10 // + -69/10
(-3/4)*t+3/5-(-69/10) = 0
(-3/4)*t+3/5+69/10 = 0
15/2-3/4*t = 0 // - 15/2
-3/4*t = -15/2 // : -3/4
t = -15/2/(-3/4)
t = 10
t = 10
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