a/7-9=-1 - solution

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Solution for a/7-9=-1 equation:

a in (-oo:+oo)

a/7-9 = -1 // + 1

a/7-9+1 = 0

1/7*a-8 = 0 // + 8

1/7*a = 8 // : 1/7

a = 8/1/7

a = 56

a = 56

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