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5*x-((1/2)*(6*x+9)) = 0
(-1/2)*(6*x+9)+5*x = 0
5*x-1/2*(6*x+9) = 0
5*x-1/2*(6*x+9) = 0
2*x-9/2 = 0
2*x-9/2 = 0
2*x-9/2 = 0 // + 9/2
2*x = 9/2 // : 2
x = 9/2/2
x = 9/4
x = 9/4
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