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6=-2.5+b
We move all terms to the left:
6-(-2.5+b)=0
We add all the numbers together, and all the variables
-(b-2.5)+6=0
We get rid of parentheses
-b+2.5+6=0
We add all the numbers together, and all the variables
-1b+8.5=0
We move all terms containing b to the left, all other terms to the right
-b=-8.5
b=-8.5/-1
b=8+0.5/1
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