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(1/4)*x-((1/8)*y) = 2 // - 2
(1/4)*x-((1/8)*y)-2 = 0
(1/4)*x+(-1/8)*y-2 = 0
1/4*x-1/8*y-2 = 0 // + -1/8*y-2
1/4*x = -(-1/8*y-2) // : 1/4
x = (-(-1/8*y-2))/1/4
x = 4*(2-(-1/8*y))
x = 4*(2-(-1/8*y))
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