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x in (-oo:+oo)
X+(1/2)*x = 15 // - 15
X+(1/2)*x-15 = 0
X+1/2*x-15 = 0 // - X-15
1/2*x = -(X-15) // : 1/2
x = (-(X-15))/1/2
x = 2*(15-X)
x = 2*(15-X)
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