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0.8(2b-1)+0.3(4-5b)=0
We add all the numbers together, and all the variables
0.8(2b-1)+0.3(-5b+4)=0
We multiply parentheses
1.6b-1.5b-0.8+1.2=0
We add all the numbers together, and all the variables
0.1b+0.4=0
We move all terms containing b to the left, all other terms to the right
0.1b=-0.4
b=-0.4/0.1
b=-4
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