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13x=(5+8)
We move all terms to the left:
13x-((5+8))=0
We add all the numbers together, and all the variables
13x-(13)=0
We add all the numbers together, and all the variables
13x-13=0
We move all terms containing x to the left, all other terms to the right
13x=13
x=13/13
x=1
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