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