90+x+(3x-18)=180

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Solution for 90+x+(3x-18)=180 equation: 



90+x+(3x-18)=180

We move all terms to the left:

90+x+(3x-18)-(180)=0

We add all the numbers together, and all the variables

x+(3x-18)-90=0

We get rid of parentheses

x+3x-18-90=0

We add all the numbers together, and all the variables

4x-108=0

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

4x=108

x=108/4

x=27

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