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(1/8)*x-((1/7)*x) = -15/56 // + -15/56
(1/8)*x-((1/7)*x)-(-15/56) = 0
(1/8)*x+(-1/7)*x+15/56 = 0
15/56-1/56*x = 0 // - 15/56
-1/56*x = -15/56 // : -1/56
x = -15/56/(-1/56)
x = 15
x = 15
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