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104=52+13x
We move all terms to the left:
104-(52+13x)=0
We add all the numbers together, and all the variables
-(13x+52)+104=0
We get rid of parentheses
-13x-52+104=0
We add all the numbers together, and all the variables
-13x+52=0
We move all terms containing x to the left, all other terms to the right
-13x=-52
x=-52/-13
x=+4
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