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50x-450=10x+30
We move all terms to the left:
50x-450-(10x+30)=0
We get rid of parentheses
50x-10x-30-450=0
We add all the numbers together, and all the variables
40x-480=0
We move all terms containing x to the left, all other terms to the right
40x=480
x=480/40
x=12
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