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0.4(b+2)=4
We move all terms to the left:
0.4(b+2)-(4)=0
We multiply parentheses
0.4b+0.8-4=0
We add all the numbers together, and all the variables
0.4b-3.2=0
We move all terms containing b to the left, all other terms to the right
0.4b=3.2
b=3.2/0.4
b=8
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