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5 = x+5*x+3/4-(4/7) // - x+5*x+3/4-(4/7)
4/7-x-(5*x)-(3/4)+5 = 0
4/7-x-5*x-3/4+5 = 0
135/28-6*x = 0 // - 135/28
-6*x = -135/28 // : -6
x = -135/28/(-6)
x = 45/56
x = 45/56
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