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x+x/100*21=45
We move all terms to the left:
x+x/100*21-(45)=0
We multiply all the terms by the denominator
x*100*21+x-45*100*21=0
We add all the numbers together, and all the variables
x+x*100*21-94500=0
Wy multiply elements
x+2100x*2-94500=0
Wy multiply elements
x+4200x-94500=0
We add all the numbers together, and all the variables
4201x-94500=0
We move all terms containing x to the left, all other terms to the right
4201x=94500
x=94500/4201
x=22+2078/4201
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