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50=2x+x+x+x
We move all terms to the left:
50-(2x+x+x+x)=0
We add all the numbers together, and all the variables
-(+5x)+50=0
We get rid of parentheses
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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