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x in (-oo:+oo)
-10 = (1/2)*x-9 // - (1/2)*x-9
9-((1/2)*x)-10 = 0
(-1/2)*x-10+9 = 0
-1/2*x-1 = 0 // + 1
-1/2*x = 1 // : -1/2
x = 1/(-1/2)
x = -2
x = -2
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