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x in (-oo:+oo)
(1/2)*x+5 = -1/2 // + -1/2
(1/2)*x-(-1/2)+5 = 0
(1/2)*x+1/2+5 = 0
1/2*x+11/2 = 0 // - 11/2
1/2*x = -11/2 // : 1/2
x = -11/2/1/2
x = -11
x = -11
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