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t in (-oo:+oo)
(-2/5)*t+1/10 = (-5/7)*t+73/70 // - (-5/7)*t+73/70
(-2/5)*t-((-5/7)*t)+1/10-(73/70) = 0
(-2/5)*t+(5/7)*t+1/10-73/70 = 0
11/35*t-33/35 = 0 // + 33/35
11/35*t = 33/35 // : 11/35
t = 33/35/11/35
t = 3
t = 3
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