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-105+8x=x+42
We move all terms to the left:
-105+8x-(x+42)=0
We get rid of parentheses
8x-x-42-105=0
We add all the numbers together, and all the variables
7x-147=0
We move all terms containing x to the left, all other terms to the right
7x=147
x=147/7
x=21
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