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x-(20x/100)=12
We move all terms to the left:
x-(20x/100)-(12)=0
We add all the numbers together, and all the variables
x-(+20x/100)-12=0
We get rid of parentheses
x-20x/100-12=0
We multiply all the terms by the denominator
x*100-20x-12*100=0
We add all the numbers together, and all the variables
-20x+x*100-1200=0
Wy multiply elements
-20x+100x-1200=0
We add all the numbers together, and all the variables
80x-1200=0
We move all terms containing x to the left, all other terms to the right
80x=1200
x=1200/80
x=15
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