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(2/3)*x-(2*y) = 6 // - 6
(2/3)*x-(2*y)-6 = 0
(2/3)*x-2*y-6 = 0
2/3*x-2*y-6 = 0 // + -2*y-6
2/3*x = -(-2*y-6) // : 2/3
x = (-(-2*y-6))/2/3
x = 3/2*(6-(-2*y))
x = 3/2*(6-(-2*y))
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