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162=13b-7
We move all terms to the left:
162-(13b-7)=0
We get rid of parentheses
-13b+7+162=0
We add all the numbers together, and all the variables
-13b+169=0
We move all terms containing b to the left, all other terms to the right
-13b=-169
b=-169/-13
b=+13
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