2+2a=20

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Solution for 2+2a=20 equation: 


a in (-oo:+oo)

2*a+2 = 20 // - 20

2*a-20+2 = 0

2*a-18 = 0 // + 18

2*a = 18 // : 2

a = 18/2

a = 9

a = 9

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