7x-20=x+100

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Solution for 7x-20=x+100 equation: 



7x-20=x+100

We move all terms to the left:

7x-20-(x+100)=0

We get rid of parentheses

7x-x-100-20=0

We add all the numbers together, and all the variables

6x-120=0

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

6x=120

x=120/6

x=20

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