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t in (-oo:+oo)
-29/42 = (-3/7)*t-(4*t)+3 // - (-3/7)*t-(4*t)+3
4*t-((-3/7)*t)-29/42-3 = 0
(3/7)*t+4*t-29/42-3 = 0
31/7*t-155/42 = 0 // + 155/42
31/7*t = 155/42 // : 31/7
t = 155/42/31/7
t = 5/6
t = 5/6
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