-9=a/-2

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Solution for -9=a/-2 equation: 


a in (-oo:+oo)

-9 = a/(-2) // - a/(-2)

-(a/(-2))-9 = 0

1/2*a-9 = 0 // + 9

1/2*a = 9 // : 1/2

a = 9/1/2

a = 18

a = 18

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