(x+18)+x=90

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



(x+18)+x=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

x+(x+18)-90=0

We get rid of parentheses

x+x+18-90=0

We add all the numbers together, and all the variables

2x-72=0

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

2x=72

x=72/2

x=36

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