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8*x-(7*(-3*x-(2/(-4)))) = -9 // + 9
8*x-(7*(-3*x-(2/(-4))))+9 = 0
8*x-7*(1/2-3*x)+9 = 0
8*x-7*(1/2-3*x)+9 = 0
29*x-7/2+9 = 0
29*x+11/2 = 0
29*x+11/2 = 0
29*x+11/2 = 0 // - 11/2
29*x = -11/2 // : 29
x = -11/2/29
x = -11/58
x = -11/58
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