(x-21)+(2x-15)=180

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Solution for (x-21)+(2x-15)=180 equation: 



(x-21)+(2x-15)=180

We move all terms to the left:

(x-21)+(2x-15)-(180)=0

We get rid of parentheses

x+2x-21-15-180=0

We add all the numbers together, and all the variables

3x-216=0

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

3x=216

x=216/3

x=72

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