7a-13=20

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Solution for 7a-13=20 equation: 



7a-13=20

We move all terms to the left:

7a-13-(20)=0

We add all the numbers together, and all the variables

7a-33=0

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

7a=33

a=33/7

a=4+5/7

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