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x in (-oo:+oo)
x/2-5 = b // - b
x/2-b-5 = 0
1/2*x-b-5 = 0 // + -b-5
1/2*x = -(-b-5) // : 1/2
x = (-(-b-5))/1/2
x = 2*(b+5)
x = 2*(b+5)
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