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28x-21-14x=42x-273
We move all terms to the left:
28x-21-14x-(42x-273)=0
We add all the numbers together, and all the variables
14x-(42x-273)-21=0
We get rid of parentheses
14x-42x+273-21=0
We add all the numbers together, and all the variables
-28x+252=0
We move all terms containing x to the left, all other terms to the right
-28x=-252
x=-252/-28
x=+9
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