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8*x-(3*x)-(4/4)+9/2 = -9 // + 9
8*x-(3*x)-(4/4)+9/2+9 = 0
8*x-3*x+9/2-1+9 = 0
5*x+25/2 = 0 // - 25/2
5*x = -25/2 // : 5
x = -25/2/5
x = -5/2
x = -5/2
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