97.9=100-8.9x

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Solution for 97.9=100-8.9x equation: 



97.9=100-8.9x

We move all terms to the left:

97.9-(100-8.9x)=0

We add all the numbers together, and all the variables

-(-8.9x+100)+97.9=0

We get rid of parentheses

8.9x-100+97.9=0

We add all the numbers together, and all the variables

8.9x-2.1=0

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

8.9x=2.1

x=2.1/8.9

x=1/4.2380952380952

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