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3*x+x+7/4-(1/2) = 15 // - 15
3*x+x+7/4-(1/2)-15 = 0
3*x+x+7/4-1/2-15 = 0
4*x-55/4 = 0 // + 55/4
4*x = 55/4 // : 4
x = 55/4/4
x = 55/16
x = 55/16
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