B/9-2=-1 - solution

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Solution for B/9-2=-1 equation:

B in (-oo:+oo)

B/9-2 = -1 // + 1

B/9-2+1 = 0

1/9*B-1 = 0 // + 1

1/9*B = 1 // : 1/9

B = 1/1/9

B = 9

B = 9

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