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x in (-oo:+oo)
X/8 = x-42 // - x-42
X/8-x+42 = 0
1/8*X-x+42 = 0 // - 1/8*X+42
-x = -(1/8*X+42) // * -1
x = 1/8*X+42
x = 1/8*X+42
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