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(5/7)*x-4 = -239/56 // + -239/56
(5/7)*x-(-239/56)-4 = 0
(5/7)*x+239/56-4 = 0
5/7*x+15/56 = 0 // - 15/56
5/7*x = -15/56 // : 5/7
x = -15/56/5/7
x = -3/8
x = -3/8
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