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a=4/9
We move all terms to the left:
a-(4/9)=0
We add all the numbers together, and all the variables
a-(+4/9)=0
We get rid of parentheses
a-4/9=0
We multiply all the terms by the denominator
a*9-4=0
Wy multiply elements
9a-4=0
We move all terms containing a to the left, all other terms to the right
9a=4
a=4/9
a=4/9
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