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t in (-oo:+oo)
(-1/2)*t-(4/7) = -129/140 // + -129/140
(-1/2)*t-(4/7)-(-129/140) = 0
(-1/2)*t-4/7+129/140 = 0
7/20-1/2*t = 0 // - 7/20
-1/2*t = -7/20 // : -1/2
t = -7/20/(-1/2)
t = 7/10
t = 7/10
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