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-15.8=b-8.4
We move all terms to the left:
-15.8-(b-8.4)=0
We get rid of parentheses
-b+8.4-15.8=0
We add all the numbers together, and all the variables
-1b-7.4=0
We move all terms containing b to the left, all other terms to the right
-b=7.4
b=7.4/-1
b=-7+0.4/1
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