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42=10+4b
We move all terms to the left:
42-(10+4b)=0
We add all the numbers together, and all the variables
-(4b+10)+42=0
We get rid of parentheses
-4b-10+42=0
We add all the numbers together, and all the variables
-4b+32=0
We move all terms containing b to the left, all other terms to the right
-4b=-32
b=-32/-4
b=+8
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