a/2+1=-1 - solution

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Solution for a/2+1=-1 equation:

a in (-oo:+oo)

a/2+1 = -1 // + 1

a/2+1+1 = 0

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

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

a = -2/1/2

a = -4

a = -4

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