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20(20-1x)=300
We move all terms to the left:
20(20-1x)-(300)=0
We add all the numbers together, and all the variables
20(-1x+20)-300=0
We multiply parentheses
-20x+400-300=0
We add all the numbers together, and all the variables
-20x+100=0
We move all terms containing x to the left, all other terms to the right
-20x=-100
x=-100/-20
x=+5
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