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(1/4)*x-((1/8)*y) = 6 // - 6
(1/4)*x-((1/8)*y)-6 = 0
(1/4)*x+(-1/8)*y-6 = 0
1/4*x-1/8*y-6 = 0 // + -1/8*y-6
1/4*x = -(-1/8*y-6) // : 1/4
x = (-(-1/8*y-6))/1/4
x = 4*(6-(-1/8*y))
x = 4*(6-(-1/8*y))
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