3a+5+a=21

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Solution for 3a+5+a=21 equation: 


a in (-oo:+oo)

3*a+a+5 = 21 // - 21

3*a+a-21+5 = 0

4*a-16 = 0 // + 16

4*a = 16 // : 4

a = 16/4

a = 4

a = 4

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