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x(2x)/2=900
We move all terms to the left:
x(2x)/2-(900)=0
We multiply all the terms by the denominator
x2x-900*2=0
We add all the numbers together, and all the variables
x2x-1800=0
We move all terms containing x to the left, all other terms to the right
x2x=1800
x=1800/1
x=1800
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