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t in (-oo:+oo)
(6/7)*t+(2/3)*t-5/6 = -437/294 // + -437/294
(6/7)*t+(2/3)*t-5/6-(-437/294) = 0
(6/7)*t+(2/3)*t-5/6+437/294 = 0
32/21*t+32/49 = 0 // - 32/49
32/21*t = -32/49 // : 32/21
t = -32/49/32/21
t = -3/7
t = -3/7
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