-a/2=1

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Solution for -a/2=1 equation: 


a in (-oo:+oo)

-a/2 = 1 // - 1

-a/2-1 = 0

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

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

a = 1/(-1/2)

a = -2

a = -2

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