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26x=15x+400
We move all terms to the left:
26x-(15x+400)=0
We get rid of parentheses
26x-15x-400=0
We add all the numbers together, and all the variables
11x-400=0
We move all terms containing x to the left, all other terms to the right
11x=400
x=400/11
x=36+4/11
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