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6*x-(75/4) = 3*x // - 3*x
6*x-(3*x)-(75/4) = 0
6*x-3*x-75/4 = 0
3*x-75/4 = 0 // + 75/4
3*x = 75/4 // : 3
x = 75/4/3
x = 25/4
x = 25/4
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