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243=5b-8
We move all terms to the left:
243-(5b-8)=0
We get rid of parentheses
-5b+8+243=0
We add all the numbers together, and all the variables
-5b+251=0
We move all terms containing b to the left, all other terms to the right
-5b=-251
b=-251/-5
b=50+1/5
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