3a+9=12

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Solution for 3a+9=12 equation: 


a in (-oo:+oo)

3*a+9 = 12 // - 12

3*a-12+9 = 0

3*a-3 = 0 // + 3

3*a = 3 // : 3

a = 3/3

a = 1

a = 1

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