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9=7b+13
We move all terms to the left:
9-(7b+13)=0
We get rid of parentheses
-7b-13+9=0
We add all the numbers together, and all the variables
-7b-4=0
We move all terms containing b to the left, all other terms to the right
-7b=4
b=4/-7
b=-4/7
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