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7=b/3+2
We move all terms to the left:
7-(b/3+2)=0
We get rid of parentheses
-b/3-2+7=0
We multiply all the terms by the denominator
-b-2*3+7*3=0
We add all the numbers together, and all the variables
-1b+15=0
We move all terms containing b to the left, all other terms to the right
-b=-15
b=-15/-1
b=+15
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