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x in (-oo:+oo)
9-((1/2)*x) = 15 // - 15
9-((1/2)*x)-15 = 0
(-1/2)*x-15+9 = 0
-1/2*x-6 = 0 // + 6
-1/2*x = 6 // : -1/2
x = 6/(-1/2)
x = -12
x = -12
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