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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x+x+18-90=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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