-a1/2+12=-9

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Solution for -a1/2+12=-9 equation: 


a in (-oo:+oo)

((-a)^1)/2+12 = -9 // + 9

((-a)^1)/2+9+12 = 0

9-a/2+12 = 0

21-1/2*a = 0 // - 21

-1/2*a = -21 // : -1/2

a = -21/(-1/2)

a = 42

a = 42

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