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x-(((5/8)/2)*x)-(10/56) = 0
x+(-5/16)*x-5/28 = 0
11/16*x-5/28 = 0 // + 5/28
11/16*x = 5/28 // : 11/16
x = 5/28/11/16
x = 20/77
x = 20/77
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