(3x-9)+(x+21)+90=180

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Solution for (3x-9)+(x+21)+90=180 equation: 



(3x-9)+(x+21)+90=180

We move all terms to the left:

(3x-9)+(x+21)+90-(180)=0

We add all the numbers together, and all the variables

(3x-9)+(x+21)-90=0

We get rid of parentheses

3x+x-9+21-90=0

We add all the numbers together, and all the variables

4x-78=0

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

4x=78

x=78/4

x=19+1/2

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