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(2/3)*x-((1/2)*y) = 3 // - 3
(2/3)*x-((1/2)*y)-3 = 0
(2/3)*x+(-1/2)*y-3 = 0
2/3*x-1/2*y-3 = 0 // + -1/2*y-3
2/3*x = -(-1/2*y-3) // : 2/3
x = (-(-1/2*y-3))/2/3
x = 3/2*(3-(-1/2*y))
x = 3/2*(3-(-1/2*y))
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