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(3/4)*x-((2/3)*y) = 12 // - 12
(3/4)*x-((2/3)*y)-12 = 0
(3/4)*x+(-2/3)*y-12 = 0
3/4*x-2/3*y-12 = 0 // + -2/3*y-12
3/4*x = -(-2/3*y-12) // : 3/4
x = (-(-2/3*y-12))/3/4
x = 4/3*(12-(-2/3*y))
x = 4/3*(12-(-2/3*y))
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