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(2/3)*x-((1/2)*y) = 12 // - 12
(2/3)*x-((1/2)*y)-12 = 0
(2/3)*x+(-1/2)*y-12 = 0
2/3*x-1/2*y-12 = 0 // + -1/2*y-12
2/3*x = -(-1/2*y-12) // : 2/3
x = (-(-1/2*y-12))/2/3
x = 3/2*(12-(-1/2*y))
x = 3/2*(12-(-1/2*y))
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