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2*x+x-(7/12) = 2*x+7/2+3 // - 2*x+7/2+3
2*x+x-(2*x)-(7/12)-(7/2)-3 = 0
2*x+x-2*x-7/12-7/2-3 = 0
x-85/12 = 0 // + 85/12
x = 85/12
x = 85/12
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