a/3-7=-1 - solution

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Solution for a/3-7=-1 equation:

a in (-oo:+oo)

a/3-7 = -1 // + 1

a/3-7+1 = 0

1/3*a-6 = 0 // + 6

1/3*a = 6 // : 1/3

a = 6/1/3

a = 18

a = 18

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