-x-1/2x=9

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Solution for -x-1/2x=9 equation: 


x in (-oo:+oo)

-x-((1/2)*x) = 9 // - 9

-x-((1/2)*x)-9 = 0

(-1/2)*x-x-9 = 0

-3/2*x-9 = 0 // + 9

-3/2*x = 9 // : -3/2

x = 9/(-3/2)

x = -6

x = -6

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