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a+a-4=a+36
We move all terms to the left:
a+a-4-(a+36)=0
We add all the numbers together, and all the variables
2a-(a+36)-4=0
We get rid of parentheses
2a-a-36-4=0
We add all the numbers together, and all the variables
a-40=0
We move all terms containing a to the left, all other terms to the right
a=40
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