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-4(72-5b)=-12b
We move all terms to the left:
-4(72-5b)-(-12b)=0
We add all the numbers together, and all the variables
-4(-5b+72)-(-12b)=0
We multiply parentheses
20b-(-12b)-288=0
We get rid of parentheses
20b+12b-288=0
We add all the numbers together, and all the variables
32b-288=0
We move all terms containing b to the left, all other terms to the right
32b=288
b=288/32
b=9
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