b/2-3=-1 - solution

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Solution for b/2-3=-1 equation:

b in (-oo:+oo)

b/2-3 = -1 // + 1

b/2-3+1 = 0

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

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

b = 2/1/2

b = 4

b = 4

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