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t in (-oo:+oo)
(-4/7)*t+1/2 = -1/14 // + -1/14
(-4/7)*t+1/2-(-1/14) = 0
(-4/7)*t+1/2+1/14 = 0
4/7-4/7*t = 0 // - 4/7
-4/7*t = -4/7 // : -4/7
t = -4/7/(-4/7)
t = 1
t = 1
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