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3x-15=9x+4
We move all terms to the left:
3x-15-(9x+4)=0
We get rid of parentheses
3x-9x-4-15=0
We add all the numbers together, and all the variables
-6x-19=0
We move all terms containing x to the left, all other terms to the right
-6x=19
x=19/-6
x=-3+1/6
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