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t in (-oo:+oo)
(3/7)*t+1/5 = -7/40 // + -7/40
(3/7)*t+1/5-(-7/40) = 0
(3/7)*t+1/5+7/40 = 0
3/7*t+3/8 = 0 // - 3/8
3/7*t = -3/8 // : 3/7
t = -3/8/3/7
t = -7/8
t = -7/8
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