A+(a+1)+(a+2)=69

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Solution for A+(a+1)+(a+2)=69 equation: 



+(A+1)+(A+2)=69

We move all terms to the left:

+(A+1)+(A+2)-(69)=0

We get rid of parentheses

A+A+1+2-69=0

We add all the numbers together, and all the variables

2A-66=0

We move all terms containing A to the left, all other terms to the right

2A=66

A=66/2

A=33

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