6+3a=21

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Solution for 6+3a=21 equation: 


a in (-oo:+oo)

3*a+6 = 21 // - 21

3*a-21+6 = 0

3*a-15 = 0 // + 15

3*a = 15 // : 3

a = 15/3

a = 5

a = 5

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