b/2=-1 - solution

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Solution for b/2=-1 equation:

b in (-oo:+oo)

b/2 = -1 // + 1

b/2+1 = 0

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

1/2*b = -1 // : 1/2

b = -1/1/2

b = -2

b = -2

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