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t in (-oo:+oo)
(2/7)*t-((1/5)*t)+1/2 = 53/70 // - 53/70
(2/7)*t-((1/5)*t)+1/2-(53/70) = 0
(2/7)*t+(-1/5)*t+1/2-53/70 = 0
3/35*t-9/35 = 0 // + 9/35
3/35*t = 9/35 // : 3/35
t = 9/35/3/35
t = 3
t = 3
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