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x-13=(2x-9)+(-x-4)
We move all terms to the left:
x-13-((2x-9)+(-x-4))=0
We add all the numbers together, and all the variables
x-((2x-9)+(-1x-4))-13=0
We calculate terms in parentheses: -((2x-9)+(-1x-4)), so:We get rid of parentheses
(2x-9)+(-1x-4)
We get rid of parentheses
2x-1x-9-4
We add all the numbers together, and all the variables
x-13
Back to the equation:
-(x-13)
x-x+13-13=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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