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x in (-oo:+oo)
X/p+x/q = s // - s
X/p+x/q-s = 0
X*p^-1+q^-1*x-s = 0 // - X*p^-1-s
q^-1*x = -(X*p^-1-s) // : q^-1
x = (-(X*p^-1-s))/(q^-1)
x = (s-(X*p^-1))/(q^-1)
x = (s-(X*p^-1))/(q^-1)
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