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