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x+(x*20/100)=100
We move all terms to the left:
x+(x*20/100)-(100)=0
We add all the numbers together, and all the variables
x+(+x*20/100)-100=0
We get rid of parentheses
x+x*20/100-100=0
We multiply all the terms by the denominator
x*100+x*20-100*100=0
We add all the numbers together, and all the variables
x*100+x*20-10000=0
Wy multiply elements
100x+20x-10000=0
We add all the numbers together, and all the variables
120x-10000=0
We move all terms containing x to the left, all other terms to the right
120x=10000
x=10000/120
x=83+1/3
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