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(4/9)+a=-(2/9)
We move all terms to the left:
(4/9)+a-(-(2/9))=0
We add all the numbers together, and all the variables
a+(+4/9)-(-(+2/9))=0
We get rid of parentheses
a+4/9-(-(+2/9))=0
We calculate fractions
a=0
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