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305x=185x+31080
We move all terms to the left:
305x-(185x+31080)=0
We get rid of parentheses
305x-185x-31080=0
We add all the numbers together, and all the variables
120x-31080=0
We move all terms containing x to the left, all other terms to the right
120x=31080
x=31080/120
x=259
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