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2(b+10)=-4
We move all terms to the left:
2(b+10)-(-4)=0
We add all the numbers together, and all the variables
2(b+10)+4=0
We multiply parentheses
2b+20+4=0
We add all the numbers together, and all the variables
2b+24=0
We move all terms containing b to the left, all other terms to the right
2b=-24
b=-24/2
b=-12
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