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t in (-oo:+oo)
(3/4)*t-((1/2)*t)-4/7 = -17/42 // + -17/42
(3/4)*t-((1/2)*t)-4/7-(-17/42) = 0
(3/4)*t+(-1/2)*t-4/7+17/42 = 0
1/4*t-1/6 = 0 // + 1/6
1/4*t = 1/6 // : 1/4
t = 1/6/1/4
t = 2/3
t = 2/3
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