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45x+120=40x+300
We move all terms to the left:
45x+120-(40x+300)=0
We get rid of parentheses
45x-40x-300+120=0
We add all the numbers together, and all the variables
5x-180=0
We move all terms containing x to the left, all other terms to the right
5x=180
x=180/5
x=36
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