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t in (-oo:+oo)
2/5-((5/6)*t)-((6/7)*t) = 481/315 // - 481/315
2/5-((5/6)*t)-((6/7)*t)-(481/315) = 0
(-5/6)*t+(-6/7)*t+2/5-481/315 = 0
-71/42*t-71/63 = 0 // + 71/63
-71/42*t = 71/63 // : -71/42
t = 71/63/(-71/42)
t = -2/3
t = -2/3
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