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3*x+x+1/2-(1/3) = 15/2 // - 15/2
3*x+x+1/2-(1/3)-(15/2) = 0
3*x+x+1/2-1/3-15/2 = 0
4*x-22/3 = 0 // + 22/3
4*x = 22/3 // : 4
x = 22/3/4
x = 11/6
x = 11/6
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