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x in (-oo:+oo)
X+x/5-(7/2) = 9 // - 9
X+x/5-(7/2)-9 = 0
X+x/5-7/2-9 = 0
X+1/5*x-25/2 = 0 // - X-25/2
1/5*x = -(X-25/2) // : 1/5
x = (-(X-25/2))/1/5
x = 5*(25/2-X)
x = 5*(25/2-X)
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