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-18.4(0.5b+2)=-15b-42.21
We move all terms to the left:
-18.4(0.5b+2)-(-15b-42.21)=0
We multiply parentheses
-0b-(-15b-42.21)-36.8=0
We get rid of parentheses
-0b+15b+42.21-36.8=0
We add all the numbers together, and all the variables
14b+5.41=0
We move all terms containing b to the left, all other terms to the right
14b=-5.41
b=-5.41/14
b=-3.8368794326241/9.9290780141844
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