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4*x-(x/2) = (5/4)*x+9 // - (5/4)*x+9
4*x-(x/2)-((5/4)*x)-9 = 0
4*x-(x/2)+(-5/4)*x-9 = 0
9/4*x-9 = 0 // + 9
9/4*x = 9 // : 9/4
x = 9/9/4
x = 4
x = 4
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