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(3/8)*(16*x-48)+3*X = 0
3/8*(16*x-48)+3*X = 0
3/8*(16*x-48)+3*X = 0
3*X+6*x-18 = 0
3*X+6*x-18 = 0
3*X+6*x-18 = 0 // - 3*X-18
6*x = -(3*X-18) // : 6
x = (-(3*X-18))/6
x = (18-(3*X))/6
x = (18-(3*X))/6
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