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9.2+(-2.8)=b
We move all terms to the left:
9.2+(-2.8)-(b)=0
We add all the numbers together, and all the variables
-1b+6.4=0
We move all terms containing b to the left, all other terms to the right
-b=-6.4
b=-6.4/-1
b=6+0.4/1
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