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(2*y)/5-((3*x)/4) = 1/2 // - 1/2
(2*y)/5-((3*x)/4)-(1/2) = 0
(-3/4)*x+(2*y)/5-1/2 = 0
2/5*y-3/4*x-1/2 = 0 // - 2/5*y-1/2
-3/4*x = -(2/5*y-1/2) // : -3/4
x = (-(2/5*y-1/2))/(-3/4)
x = -4/3*(1/2-(2/5*y))
x = -4/3*(1/2-(2/5*y))
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