-8+a/21=-9 - solution

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Solution for -8+a/21=-9 equation:

a in (-oo:+oo)

a/21-8 = -9 // + 9

a/21-8+9 = 0

1/21*a+1 = 0 // - 1

1/21*a = -1 // : 1/21

a = -1/1/21

a = -21

a = -21

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