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3x+0=8x+9
We move all terms to the left:
3x+0-(8x+9)=0
We add all the numbers together, and all the variables
3x-(8x+9)=0
We get rid of parentheses
3x-8x-9=0
We add all the numbers together, and all the variables
-5x-9=0
We move all terms containing x to the left, all other terms to the right
-5x=9
x=9/-5
x=-1+4/5
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