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b-2.8=0.5b+1.2
We move all terms to the left:
b-2.8-(0.5b+1.2)=0
We get rid of parentheses
b-0.5b-1.2-2.8=0
We add all the numbers together, and all the variables
0.5b-4=0
We move all terms containing b to the left, all other terms to the right
0.5b=4
b=4/0.5
b=8
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