7x=100-x

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Solution for 7x=100-x equation: 



7x=100-x

We move all terms to the left:

7x-(100-x)=0

We add all the numbers together, and all the variables

7x-(-1x+100)=0

We get rid of parentheses

7x+1x-100=0

We add all the numbers together, and all the variables

8x-100=0

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

8x=100

x=100/8

x=12+1/2

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