9+3a=42

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Solution for 9+3a=42 equation: 


a in (-oo:+oo)

3*a+9 = 42 // - 42

3*a-42+9 = 0

3*a-33 = 0 // + 33

3*a = 33 // : 3

a = 33/3

a = 11

a = 11

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