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2*x-(6/7) = 4*X-(6/2) // - 4*X-(6/2)
2*x-(4*X)-(6/7)+6/2 = 0
2*x-4*X-6/7+6/2 = 0
2*x-4*X+15/7 = 0 // - 15/7-4*X
2*x = -(15/7-4*X) // : 2
x = (-(15/7-4*X))/2
x = (-(15/7-4*X))/2
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