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t in (-oo:+oo)
(1/3)*t+7*t-(3/7) = -851/189 // + -851/189
(1/3)*t+7*t-(3/7)-(-851/189) = 0
(1/3)*t+7*t-3/7+851/189 = 0
22/3*t+110/27 = 0 // - 110/27
22/3*t = -110/27 // : 22/3
t = -110/27/22/3
t = -5/9
t = -5/9
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