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462=42x+84
We move all terms to the left:
462-(42x+84)=0
We get rid of parentheses
-42x-84+462=0
We add all the numbers together, and all the variables
-42x+378=0
We move all terms containing x to the left, all other terms to the right
-42x=-378
x=-378/-42
x=+9
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