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26x+21=13x-9
We move all terms to the left:
26x+21-(13x-9)=0
We get rid of parentheses
26x-13x+9+21=0
We add all the numbers together, and all the variables
13x+30=0
We move all terms containing x to the left, all other terms to the right
13x=-30
x=-30/13
x=-2+4/13
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