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50x+100=40x+120
We move all terms to the left:
50x+100-(40x+120)=0
We get rid of parentheses
50x-40x-120+100=0
We add all the numbers together, and all the variables
10x-20=0
We move all terms containing x to the left, all other terms to the right
10x=20
x=20/10
x=2
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