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9x+15=3x+159x+15=3x+15
We move all terms to the left:
9x+15-(3x+159x+15)=0
We add all the numbers together, and all the variables
9x-(162x+15)+15=0
We get rid of parentheses
9x-162x-15+15=0
We add all the numbers together, and all the variables
-153x=0
x=0/-153
x=0
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