3x-20=90+x

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Solution for 3x-20=90+x equation: 



3x-20=90+x

We move all terms to the left:

3x-20-(90+x)=0

We add all the numbers together, and all the variables

3x-(x+90)-20=0

We get rid of parentheses

3x-x-90-20=0

We add all the numbers together, and all the variables

2x-110=0

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

2x=110

x=110/2

x=55

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