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-167/168 = (4/7)*x-5*x+2/3 // - (4/7)*x-5*x+2/3
-(-5*x)-((4/7)*x)-167/168-(2/3) = 0
5*x+(-4/7)*x-167/168-2/3 = 0
31/7*x-93/56 = 0 // + 93/56
31/7*x = 93/56 // : 31/7
x = 93/56/31/7
x = 3/8
x = 3/8
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