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(x-13)-65=65-(x-13)
We move all terms to the left:
(x-13)-65-(65-(x-13))=0
We get rid of parentheses
x-(65-(x-13))-13-65=0
We calculate terms in parentheses: -(65-(x-13)), so:We add all the numbers together, and all the variables
65-(x-13)
determiningTheFunctionDomain -(x-13)+65
We get rid of parentheses
-x+13+65
We add all the numbers together, and all the variables
-1x+78
Back to the equation:
-(-1x+78)
x-(-1x+78)-78=0
We get rid of parentheses
x+1x-78-78=0
We add all the numbers together, and all the variables
2x-156=0
We move all terms containing x to the left, all other terms to the right
2x=156
x=156/2
x=78
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