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t in (-oo:+oo)
613/36 = 3*t+(1/4)*t+7/9 // - 3*t+(1/4)*t+7/9
613/36-(3*t)-((1/4)*t)-(7/9) = 0
(-1/4)*t-3*t+613/36-7/9 = 0
65/4-13/4*t = 0 // - 65/4
-13/4*t = -65/4 // : -13/4
t = -65/4/(-13/4)
t = 5
t = 5
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