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3*a-((1/2)*b)-((3/2)*b)+9*x = 0
3*a+(-1/2)*b+(-3/2)*b+9*x = 0
3*a-2*b+9*x = 0 // - 3*a-2*b
9*x = -(3*a-2*b) // : 9
x = (-(3*a-2*b))/9
x = (-(3*a-2*b))/9
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