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(2/3)*x-((3/4)*y) = 6 // - 6
(2/3)*x-((3/4)*y)-6 = 0
(2/3)*x+(-3/4)*y-6 = 0
2/3*x-3/4*y-6 = 0 // + -3/4*y-6
2/3*x = -(-3/4*y-6) // : 2/3
x = (-(-3/4*y-6))/2/3
x = 3/2*(6-(-3/4*y))
x = 3/2*(6-(-3/4*y))
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