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(7/8)*x-1 = (-15/16)*x+4 // - (-15/16)*x+4
(7/8)*x-((-15/16)*x)-4-1 = 0
(7/8)*x+(15/16)*x-4-1 = 0
29/16*x-5 = 0 // + 5
29/16*x = 5 // : 29/16
x = 5/29/16
x = 80/29
x = 80/29
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