(x-12)+2x=90

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Solution for (x-12)+2x=90 equation: 



(x-12)+2x=90

We move all terms to the left:

(x-12)+2x-(90)=0

We add all the numbers together, and all the variables

2x+(x-12)-90=0

We get rid of parentheses

2x+x-12-90=0

We add all the numbers together, and all the variables

3x-102=0

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

3x=102

x=102/3

x=34

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