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t in (-oo:+oo)
(-2/7)*t+7*t+1/5 = -649/280 // + -649/280
(-2/7)*t+7*t+1/5-(-649/280) = 0
(-2/7)*t+7*t+1/5+649/280 = 0
47/7*t+141/56 = 0 // - 141/56
47/7*t = -141/56 // : 47/7
t = -141/56/47/7
t = -3/8
t = -3/8
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