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x in (-oo:+oo)
2*y = x/8 // - x/8
2*y-(x/8) = 0
2*y-1/8*x = 0 // - 2*y
-1/8*x = -(2*y) // : -1/8
x = (-(2*y))/(-1/8)
x = 16*y
x = 16*y
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