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x in (-oo:+oo)
(1/4)*x-((1/8)*y) = 5 // - 5
(1/4)*x-((1/8)*y)-5 = 0
(1/4)*x+(-1/8)*y-5 = 0
1/4*x-1/8*y-5 = 0 // + -1/8*y-5
1/4*x = -(-1/8*y-5) // : 1/4
x = (-(-1/8*y-5))/1/4
x = 4*(5-(-1/8*y))
x = 4*(5-(-1/8*y))
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