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t in (-oo:+oo)
(-3/5)*t-6 = (5/7)*t-(256/35) // - (5/7)*t-(256/35)
(-3/5)*t-((5/7)*t)+256/35-6 = 0
(-3/5)*t+(-5/7)*t+256/35-6 = 0
46/35-46/35*t = 0 // - 46/35
-46/35*t = -46/35 // : -46/35
t = -46/35/(-46/35)
t = 1
t = 1
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