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(a-10)+(a/10)=200
We move all terms to the left:
(a-10)+(a/10)-(200)=0
We add all the numbers together, and all the variables
(a-10)+(+a/10)-200=0
We get rid of parentheses
a+a/10-10-200=0
We multiply all the terms by the denominator
a*10+a-10*10-200*10=0
We add all the numbers together, and all the variables
a+a*10-2100=0
Wy multiply elements
a+10a-2100=0
We add all the numbers together, and all the variables
11a-2100=0
We move all terms containing a to the left, all other terms to the right
11a=2100
a=2100/11
a=190+10/11
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