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