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a+(a*5/100)=105
We move all terms to the left:
a+(a*5/100)-(105)=0
We add all the numbers together, and all the variables
a+(+a*5/100)-105=0
We get rid of parentheses
a+a*5/100-105=0
We multiply all the terms by the denominator
a*100+a*5-105*100=0
We add all the numbers together, and all the variables
a*100+a*5-10500=0
Wy multiply elements
100a+5a-10500=0
We add all the numbers together, and all the variables
105a-10500=0
We move all terms containing a to the left, all other terms to the right
105a=10500
a=10500/105
a=100
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