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4(-15)=4b-270
We move all terms to the left:
4(-15)-(4b-270)=0
We add all the numbers together, and all the variables
-(4b-270)-60=0
We get rid of parentheses
-4b+270-60=0
We add all the numbers together, and all the variables
-4b+210=0
We move all terms containing b to the left, all other terms to the right
-4b=-210
b=-210/-4
b=52+1/2
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