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647=9x+377
We move all terms to the left:
647-(9x+377)=0
We get rid of parentheses
-9x-377+647=0
We add all the numbers together, and all the variables
-9x+270=0
We move all terms containing x to the left, all other terms to the right
-9x=-270
x=-270/-9
x=+30
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