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x+2*x+7/6-(8/2) = -4 // + 4
x+2*x+7/6-(8/2)+4 = 0
x+2*x+7/6-4+4 = 0
3*x+7/6 = 0 // - 7/6
3*x = -7/6 // : 3
x = -7/6/3
x = -7/18
x = -7/18
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