5a+7(a+15)=12a+1a

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Solution for 5a+7(a+15)=12a+1a equation: 



5a+7(a+15)=12a+1a

We move all terms to the left:

5a+7(a+15)-(12a+1a)=0

We add all the numbers together, and all the variables

5a+7(a+15)-(+13a)=0

We multiply parentheses

5a+7a-(+13a)+105=0

We get rid of parentheses

5a+7a-13a+105=0

We add all the numbers together, and all the variables

-1a+105=0

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

-a=-105

a=-105/-1

a=+105

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