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5a+40=a+100
We move all terms to the left:
5a+40-(a+100)=0
We get rid of parentheses
5a-a-100+40=0
We add all the numbers together, and all the variables
4a-60=0
We move all terms containing a to the left, all other terms to the right
4a=60
a=60/4
a=15
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