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t in (-oo:+oo)
(-2/3)*t+2*t = (6/5)*t+6/5 // - (6/5)*t+6/5
(-2/3)*t+2*t-((6/5)*t)-(6/5) = 0
(-2/3)*t+2*t+(-6/5)*t-6/5 = 0
2/15*t-6/5 = 0 // + 6/5
2/15*t = 6/5 // : 2/15
t = 6/5/2/15
t = 9
t = 9
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