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(3/7)*x-(2*y) = 2/3 // - 2/3
(3/7)*x-(2*y)-(2/3) = 0
(3/7)*x-2*y-2/3 = 0
3/7*x-2*y-2/3 = 0 // + -2*y-2/3
3/7*x = -(-2*y-2/3) // : 3/7
x = (-(-2*y-2/3))/3/7
x = 7/3*(2/3-(-2*y))
x = 7/3*(2/3-(-2*y))
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