3(10+a)=99

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Solution for 3(10+a)=99 equation: 



3(10+a)=99

We move all terms to the left:

3(10+a)-(99)=0

We add all the numbers together, and all the variables

3(a+10)-99=0

We multiply parentheses

3a+30-99=0

We add all the numbers together, and all the variables

3a-69=0

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

3a=69

a=69/3

a=23

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