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x in (-oo:+oo)
X+x+x+(1/2)*x-40-35 = 0
X+5/2*x-75 = 0 // - X-75
5/2*x = -(X-75) // : 5/2
x = (-(X-75))/5/2
x = 2/5*(75-X)
x = 2/5*(75-X)
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