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30=26-a-6
We move all terms to the left:
30-(26-a-6)=0
We add all the numbers together, and all the variables
-(-1a+20)+30=0
We get rid of parentheses
1a-20+30=0
We add all the numbers together, and all the variables
a+10=0
We move all terms containing a to the left, all other terms to the right
a=-10
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