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36=54-9a
We move all terms to the left:
36-(54-9a)=0
We add all the numbers together, and all the variables
-(-9a+54)+36=0
We get rid of parentheses
9a-54+36=0
We add all the numbers together, and all the variables
9a-18=0
We move all terms containing a to the left, all other terms to the right
9a=18
a=18/9
a=2
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