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-15=3-x
We move all terms to the left:
-15-(3-x)=0
We add all the numbers together, and all the variables
-(-1x+3)-15=0
We get rid of parentheses
1x-3-15=0
We add all the numbers together, and all the variables
x-18=0
We move all terms containing x to the left, all other terms to the right
x=18
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