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4(b-20)=-12
We move all terms to the left:
4(b-20)-(-12)=0
We add all the numbers together, and all the variables
4(b-20)+12=0
We multiply parentheses
4b-80+12=0
We add all the numbers together, and all the variables
4b-68=0
We move all terms containing b to the left, all other terms to the right
4b=68
b=68/4
b=17
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