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90a-83=26a-19
We move all terms to the left:
90a-83-(26a-19)=0
We get rid of parentheses
90a-26a+19-83=0
We add all the numbers together, and all the variables
64a-64=0
We move all terms containing a to the left, all other terms to the right
64a=64
a=64/64
a=1
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