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(13)3=(13)x+13
We move all terms to the left:
(13)3-((13)x+13)=0
We get rid of parentheses
-13x-13+133=0
We add all the numbers together, and all the variables
-13x+120=0
We move all terms containing x to the left, all other terms to the right
-13x=-120
x=-120/-13
x=9+3/13
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