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-15+3x=7x-x
We move all terms to the left:
-15+3x-(7x-x)=0
We add all the numbers together, and all the variables
3x-(+6x)-15=0
We get rid of parentheses
3x-6x-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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