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-7(2b-3)=133
We move all terms to the left:
-7(2b-3)-(133)=0
We multiply parentheses
-14b+21-133=0
We add all the numbers together, and all the variables
-14b-112=0
We move all terms containing b to the left, all other terms to the right
-14b=112
b=112/-14
b=-8
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