3a+1+a=21

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Solution for 3a+1+a=21 equation: 


a in (-oo:+oo)

3*a+a+1 = 21 // - 21

3*a+a-21+1 = 0

4*a-20 = 0 // + 20

4*a = 20 // : 4

a = 20/4

a = 5

a = 5

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