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-13a-17-5a=2a-10-20a-7
We move all terms to the left:
-13a-17-5a-(2a-10-20a-7)=0
We add all the numbers together, and all the variables
-13a-5a-(-18a-17)-17=0
We add all the numbers together, and all the variables
-18a-(-18a-17)-17=0
We get rid of parentheses
-18a+18a+17-17=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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