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3x+225=9+15x
We move all terms to the left:
3x+225-(9+15x)=0
We add all the numbers together, and all the variables
3x-(15x+9)+225=0
We get rid of parentheses
3x-15x-9+225=0
We add all the numbers together, and all the variables
-12x+216=0
We move all terms containing x to the left, all other terms to the right
-12x=-216
x=-216/-12
x=+18
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