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(2/3)*x-(1/2) = (1/2)*x+4 // - (1/2)*x+4
(2/3)*x-((1/2)*x)-(1/2)-4 = 0
(2/3)*x+(-1/2)*x-1/2-4 = 0
1/6*x-9/2 = 0 // + 9/2
1/6*x = 9/2 // : 1/6
x = 9/2/1/6
x = 27
x = 27
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