(7x+18)+(5x-12)=90

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Solution for (7x+18)+(5x-12)=90 equation: 



(7x+18)+(5x-12)=90

We move all terms to the left:

(7x+18)+(5x-12)-(90)=0

We get rid of parentheses

7x+5x+18-12-90=0

We add all the numbers together, and all the variables

12x-84=0

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

12x=84

x=84/12

x=7

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