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0.9(0.5+0.8)-0.4(0.6b+1.8)=0.21b
We move all terms to the left:
0.9(0.5+0.8)-0.4(0.6b+1.8)-(0.21b)=0
We add all the numbers together, and all the variables
-0.4(0.6b+1.8)-(+0.21b)+0.9(1.3)=0
We add all the numbers together, and all the variables
-0.4(0.6b+1.8)-(+0.21b)+1.17=0
We multiply parentheses
-0b-(+0.21b)-0.72+1.17=0
We get rid of parentheses
-0b-0.21b-0.72+1.17=0
We add all the numbers together, and all the variables
-1.21b+0.45=0
We move all terms containing b to the left, all other terms to the right
-1.21b=-0.45
b=-0.45/-1.21
b=0.45/1.21
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