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t in (-oo:+oo)
3*t-((2/7)*t)-3/10 = -801/770 // + -801/770
3*t-((2/7)*t)-3/10-(-801/770) = 0
3*t+(-2/7)*t-3/10+801/770 = 0
19/7*t+57/77 = 0 // - 57/77
19/7*t = -57/77 // : 19/7
t = -57/77/19/7
t = -3/11
t = -3/11
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