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x-3x=x-15
We move all terms to the left:
x-3x-(x-15)=0
We add all the numbers together, and all the variables
-2x-(x-15)=0
We get rid of parentheses
-2x-x+15=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5
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