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