-a/2=12/4

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Solution for -a/2=12/4 equation: 


a in (-oo:+oo)

-a/2 = 12/4 // - 12/4

-a/2-(12/4) = 0

-a/2-3 = 0

-1/2*a-3 = 0 // + 3

-1/2*a = 3 // : -1/2

a = 3/(-1/2)

a = -6

a = -6

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