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3*x+6 = 17/4 // - 17/4
3*x-(17/4)+6 = 0
3*x-17/4+6 = 0
3*x+7/4 = 0 // - 7/4
3*x = -7/4 // : 3
x = -7/4/3
x = -7/12
x = -7/12
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