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9x=3x+40
We move all terms to the left:
9x-(3x+40)=0
We get rid of parentheses
9x-3x-40=0
We add all the numbers together, and all the variables
6x-40=0
We move all terms containing x to the left, all other terms to the right
6x=40
x=40/6
x=6+2/3
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