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t in (-oo:+oo)
(-4/7)*(4*t+2) = (5/28)*t-13 // - (5/28)*t-13
(-4/7)*(4*t+2)-((5/28)*t)+13 = 0
(-4/7)*(4*t+2)+(-5/28)*t+13 = 0
(-5*t)/28-4/7*(4*t+2)+13 = 0
(-4/7*28*(4*t+2))/28+(-5*t)/28+(13*28)/28 = 0
13*28-4/7*28*(4*t+2)-5*t = 0
364-69*t-32 = 0
332-69*t = 0
(332-69*t)/28 = 0
(332-69*t)/28 = 0 // * 28
332-69*t = 0
332-69*t = 0 // - 332
-69*t = -332 // : -69
t = -332/(-69)
t = 332/69
t = 332/69
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