2a+3=21

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Solution for 2a+3=21 equation: 


a in (-oo:+oo)

2*a+3 = 21 // - 21

2*a-21+3 = 0

2*a-18 = 0 // + 18

2*a = 18 // : 2

a = 18/2

a = 9

a = 9

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