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5x-678=786+3x
We move all terms to the left:
5x-678-(786+3x)=0
We add all the numbers together, and all the variables
5x-(3x+786)-678=0
We get rid of parentheses
5x-3x-786-678=0
We add all the numbers together, and all the variables
2x-1464=0
We move all terms containing x to the left, all other terms to the right
2x=1464
x=1464/2
x=732
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