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9a+40=5a+49
We move all terms to the left:
9a+40-(5a+49)=0
We get rid of parentheses
9a-5a-49+40=0
We add all the numbers together, and all the variables
4a-9=0
We move all terms containing a to the left, all other terms to the right
4a=9
a=9/4
a=2+1/4
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