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2x+15=x+(x+15)
We move all terms to the left:
2x+15-(x+(x+15))=0
We calculate terms in parentheses: -(x+(x+15)), so:We get rid of parentheses
x+(x+15)
We get rid of parentheses
x+x+15
We add all the numbers together, and all the variables
2x+15
Back to the equation:
-(2x+15)
2x-2x-15+15=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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