a-9=7a-81

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Solution for a-9=7a-81 equation: 


a in (-oo:+oo)

a-9 = 7*a-81 // - 7*a-81

a-(7*a)-9+81 = 0

a-7*a-9+81 = 0

72-6*a = 0 // - 72

-6*a = -72 // : -6

a = -72/(-6)

a = 12

a = 12

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