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420x+210=468x-78
We move all terms to the left:
420x+210-(468x-78)=0
We get rid of parentheses
420x-468x+78+210=0
We add all the numbers together, and all the variables
-48x+288=0
We move all terms containing x to the left, all other terms to the right
-48x=-288
x=-288/-48
x=+6
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