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x in (-oo:+oo)
9-7*x-((1/2)*x) = -6 // + 6
6-7*x-((1/2)*x)+9 = 0
(-1/2)*x-7*x+6+9 = 0
15-15/2*x = 0 // - 15
-15/2*x = -15 // : -15/2
x = -15/(-15/2)
x = 2
x = 2
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