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t in (-oo:+oo)
(4/5)*t+3*t+2/7 = 268/7 // - 268/7
(4/5)*t+3*t+2/7-(268/7) = 0
(4/5)*t+3*t+2/7-268/7 = 0
19/5*t-38 = 0 // + 38
19/5*t = 38 // : 19/5
t = 38/19/5
t = 10
t = 10
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