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t in (-oo:+oo)
-53/10 = 7*t+7*t+3/10 // - 7*t+7*t+3/10
-(7*t)-(7*t)-53/10-(3/10) = 0
-7*t-7*t-53/10-3/10 = 0
-14*t-28/5 = 0 // + 28/5
-14*t = 28/5 // : -14
t = 28/5/(-14)
t = -2/5
t = -2/5
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