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x in (-oo:+oo)
1*(1/2)*x = -9 // + 9
1*(1/2)*x+9 = 0
(1/2)*x+9 = 0
1/2*x+9 = 0 // - 9
1/2*x = -9 // : 1/2
x = -9/1/2
x = -18
x = -18
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