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(2/3)*x+(3/4)*y = 1 // - 1
(2/3)*x+(3/4)*y-1 = 0
2/3*x+3/4*y-1 = 0 // - 3/4*y-1
2/3*x = -(3/4*y-1) // : 2/3
x = (-(3/4*y-1))/2/3
x = 3/2*(1-(3/4*y))
x = 3/2*(1-(3/4*y))
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