3x+18=90-x

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Solution for 3x+18=90-x equation: 



3x+18=90-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(-1x+90)+18=0

We get rid of parentheses

3x+1x-90+18=0

We add all the numbers together, and all the variables

4x-72=0

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

4x=72

x=72/4

x=18

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