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t in (-oo:+oo)
3*t-(2/5) = (-6/7)*t+31/35 // - (-6/7)*t+31/35
3*t-((-6/7)*t)-(2/5)-(31/35) = 0
3*t+(6/7)*t-2/5-31/35 = 0
27/7*t-9/7 = 0 // + 9/7
27/7*t = 9/7 // : 27/7
t = 9/7/27/7
t = 1/3
t = 1/3
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