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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