9-7a=30

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Solution for 9-7a=30 equation: 


a in (-oo:+oo)

9-(7*a) = 30 // - 30

9-(7*a)-30 = 0

9-7*a-30 = 0

-7*a-21 = 0 // + 21

-7*a = 21 // : -7

a = 21/(-7)

a = -3

a = -3

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