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-3(8+5b)=-144
We move all terms to the left:
-3(8+5b)-(-144)=0
We add all the numbers together, and all the variables
-3(5b+8)-(-144)=0
We add all the numbers together, and all the variables
-3(5b+8)+144=0
We multiply parentheses
-15b-24+144=0
We add all the numbers together, and all the variables
-15b+120=0
We move all terms containing b to the left, all other terms to the right
-15b=-120
b=-120/-15
b=+8
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