0.09a+0.1(100-a)=9.7

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Solution for 0.09a+0.1(100-a)=9.7 equation: 



0.09a+0.1(100-a)=9.7

We move all terms to the left:

0.09a+0.1(100-a)-(9.7)=0

We add all the numbers together, and all the variables

0.09a+0.1(-1a+100)-(9.7)=0

We add all the numbers together, and all the variables

0.09a+0.1(-1a+100)-9.7=0

We multiply parentheses

0.09a-0.1a+10-9.7=0

We add all the numbers together, and all the variables

-0.01a+0.3=0

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

-0.01a=-0.3

a=-0.3/-0.01

a=+30

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