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x(2x)/2=169
We move all terms to the left:
x(2x)/2-(169)=0
We multiply all the terms by the denominator
x2x-169*2=0
We add all the numbers together, and all the variables
x2x-338=0
We move all terms containing x to the left, all other terms to the right
x2x=338
x=338/1
x=338
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