-13+3a+5a=3a+7

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Solution for -13+3a+5a=3a+7 equation: 



-13+3a+5a=3a+7

We move all terms to the left:

-13+3a+5a-(3a+7)=0

We add all the numbers together, and all the variables

8a-(3a+7)-13=0

We get rid of parentheses

8a-3a-7-13=0

We add all the numbers together, and all the variables

5a-20=0

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

5a=20

a=20/5

a=4

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