(12+x)+(5x)=90

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



(12+x)+(5x)=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

5x+x+12-90=0

We add all the numbers together, and all the variables

6x-78=0

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

6x=78

x=78/6

x=13

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