5a+7(a+15)=12a+5a

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Solution for 5a+7(a+15)=12a+5a equation: 



5a+7(a+15)=12a+5a

We move all terms to the left:

5a+7(a+15)-(12a+5a)=0

We add all the numbers together, and all the variables

5a+7(a+15)-(+17a)=0

We multiply parentheses

5a+7a-(+17a)+105=0

We get rid of parentheses

5a+7a-17a+105=0

We add all the numbers together, and all the variables

-5a+105=0

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

-5a=-105

a=-105/-5

a=+21

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