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50=100+2x
We move all terms to the left:
50-(100+2x)=0
We add all the numbers together, and all the variables
-(2x+100)+50=0
We get rid of parentheses
-2x-100+50=0
We add all the numbers together, and all the variables
-2x-50=0
We move all terms containing x to the left, all other terms to the right
-2x=50
x=50/-2
x=-25
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