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26=5a+21
We move all terms to the left:
26-(5a+21)=0
We get rid of parentheses
-5a-21+26=0
We add all the numbers together, and all the variables
-5a+5=0
We move all terms containing a to the left, all other terms to the right
-5a=-5
a=-5/-5
a=1
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