7(19-4a)=13-20a

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Solution for 7(19-4a)=13-20a equation: 



7(19-4a)=13-20a

We move all terms to the left:

7(19-4a)-(13-20a)=0

We add all the numbers together, and all the variables

7(-4a+19)-(-20a+13)=0

We multiply parentheses

-28a-(-20a+13)+133=0

We get rid of parentheses

-28a+20a-13+133=0

We add all the numbers together, and all the variables

-8a+120=0

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

-8a=-120

a=-120/-8

a=+15

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