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-4(10b-9)=156
We move all terms to the left:
-4(10b-9)-(156)=0
We multiply parentheses
-40b+36-156=0
We add all the numbers together, and all the variables
-40b-120=0
We move all terms containing b to the left, all other terms to the right
-40b=120
b=120/-40
b=-3
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