a+a*20=100

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Solution for a+a*20=100 equation: 



a+a*20=100

We move all terms to the left:

a+a*20-(100)=0

Wy multiply elements

a+20a-100=0

We add all the numbers together, and all the variables

21a-100=0

We move all terms containing a to the left, all other terms to the right

21a=100

a=100/21

a=4+16/21

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