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x in (-oo:+oo)
(8/7)*(14*x-7) = (5/6)*(12*x-18) // - (5/6)*(12*x-18)
(8/7)*(14*x-7)-((5/6)*(12*x-18)) = 0
(8/7)*(14*x-7)+(-5/6)*(12*x-18) = 0
8/7*(14*x-7)-5/6*(12*x-18) = 0
8/7*(14*x-7)-5/6*(12*x-18) = 0
6*x+7 = 0
6*x+7 = 0
6*x+7 = 0 // - 7
6*x = -7 // : 6
x = -7/6
x = -7/6
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