(x-12)+x+(x+3)=90

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Solution for (x-12)+x+(x+3)=90 equation: 



(x-12)+x+(x+3)=90

We move all terms to the left:

(x-12)+x+(x+3)-(90)=0

We add all the numbers together, and all the variables

x+(x-12)+(x+3)-90=0

We get rid of parentheses

x+x+x-12+3-90=0

We add all the numbers together, and all the variables

3x-99=0

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

3x=99

x=99/3

x=33

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