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26=20-2a
We move all terms to the left:
26-(20-2a)=0
We add all the numbers together, and all the variables
-(-2a+20)+26=0
We get rid of parentheses
2a-20+26=0
We add all the numbers together, and all the variables
2a+6=0
We move all terms containing a to the left, all other terms to the right
2a=-6
a=-6/2
a=-3
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