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15.9=11.3+b
We move all terms to the left:
15.9-(11.3+b)=0
We add all the numbers together, and all the variables
-(b+11.3)+15.9=0
We get rid of parentheses
-b-11.3+15.9=0
We add all the numbers together, and all the variables
-1b+4.6=0
We move all terms containing b to the left, all other terms to the right
-b=-4.6
b=-4.6/-1
b=4+0.6/1
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