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7+a/3=10
We move all terms to the left:
7+a/3-(10)=0
We add all the numbers together, and all the variables
a/3-3=0
We multiply all the terms by the denominator
a-3*3=0
We add all the numbers together, and all the variables
a-9=0
We move all terms containing a to the left, all other terms to the right
a=9
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