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3*x-(1/2) = 7/18-x // - 7/18-x
3*x+x-(1/2)-(7/18) = 0
3*x+x-1/2-7/18 = 0
4*x-8/9 = 0 // + 8/9
4*x = 8/9 // : 4
x = 8/9/4
x = 2/9
x = 2/9
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