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t in (-oo:+oo)
190/21 = (5/7)*t+(3/7)*t+10 // - (5/7)*t+(3/7)*t+10
190/21-((5/7)*t)-((3/7)*t)-10 = 0
(-5/7)*t+(-3/7)*t+190/21-10 = 0
-8/7*t-20/21 = 0 // + 20/21
-8/7*t = 20/21 // : -8/7
t = 20/21/(-8/7)
t = -5/6
t = -5/6
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