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x in (-oo:+oo)
X/4-x = 15 // - 15
X/4-x-15 = 0
1/4*X-x-15 = 0 // - 1/4*X-15
-x = -(1/4*X-15) // * -1
x = 1/4*X-15
x = 1/4*X-15
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