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207=-13-10a
We move all terms to the left:
207-(-13-10a)=0
We add all the numbers together, and all the variables
-(-10a-13)+207=0
We get rid of parentheses
10a+13+207=0
We add all the numbers together, and all the variables
10a+220=0
We move all terms containing a to the left, all other terms to the right
10a=-220
a=-220/10
a=-22
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