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877=357+2b
We move all terms to the left:
877-(357+2b)=0
We add all the numbers together, and all the variables
-(2b+357)+877=0
We get rid of parentheses
-2b-357+877=0
We add all the numbers together, and all the variables
-2b+520=0
We move all terms containing b to the left, all other terms to the right
-2b=-520
b=-520/-2
b=+260
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