-11=-9+a/2

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Solution for -11=-9+a/2 equation: 


a in (-oo:+oo)

-11 = a/2-9 // - a/2-9

9-(a/2)-11 = 0

-1/2*a-2 = 0 // + 2

-1/2*a = 2 // : -1/2

a = 2/(-1/2)

a = -4

a = -4

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