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(1/2)*x-((1/8)*y) = 3 // - 3
(1/2)*x-((1/8)*y)-3 = 0
(1/2)*x+(-1/8)*y-3 = 0
1/2*x-1/8*y-3 = 0 // + -1/8*y-3
1/2*x = -(-1/8*y-3) // : 1/2
x = (-(-1/8*y-3))/1/2
x = 2*(3-(-1/8*y))
x = 2*(3-(-1/8*y))
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