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(1/2)*x-((1/4)*y) = 6 // - 6
(1/2)*x-((1/4)*y)-6 = 0
(1/2)*x+(-1/4)*y-6 = 0
1/2*x-1/4*y-6 = 0 // + -1/4*y-6
1/2*x = -(-1/4*y-6) // : 1/2
x = (-(-1/4*y-6))/1/2
x = 2*(6-(-1/4*y))
x = 2*(6-(-1/4*y))
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