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1000=100a/0.2
We move all terms to the left:
1000-(100a/0.2)=0
We add all the numbers together, and all the variables
-(+100a/0.2)+1000=0
We get rid of parentheses
-100a/0.2+1000=0
We multiply all the terms by the denominator
-100a+1000*0.2=0
We add all the numbers together, and all the variables
-100a+200=0
We move all terms containing a to the left, all other terms to the right
-100a=-200
a=-200/-100
a=+2
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