5a+1=21

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Solution for 5a+1=21 equation: 


a in (-oo:+oo)

5*a+1 = 21 // - 21

5*a-21+1 = 0

5*a-20 = 0 // + 20

5*a = 20 // : 5

a = 20/5

a = 4

a = 4

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