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3x+20=9x+10
We move all terms to the left:
3x+20-(9x+10)=0
We get rid of parentheses
3x-9x-10+20=0
We add all the numbers together, and all the variables
-6x+10=0
We move all terms containing x to the left, all other terms to the right
-6x=-10
x=-10/-6
x=1+2/3
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