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t in (-oo:+oo)
(2/5)*t+5/7 = 18/35 // - 18/35
(2/5)*t+5/7-(18/35) = 0
(2/5)*t+5/7-18/35 = 0
2/5*t+1/5 = 0 // - 1/5
2/5*t = -1/5 // : 2/5
t = -1/5/2/5
t = -1/2
t = -1/2
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