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