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9x+206=4x+421
We move all terms to the left:
9x+206-(4x+421)=0
We get rid of parentheses
9x-4x-421+206=0
We add all the numbers together, and all the variables
5x-215=0
We move all terms containing x to the left, all other terms to the right
5x=215
x=215/5
x=43
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