(X-20)+(x-10)=180

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Solution for (X-20)+(x-10)=180 equation: 



(X-20)+(X-10)=180

We move all terms to the left:

(X-20)+(X-10)-(180)=0

We get rid of parentheses

X+X-20-10-180=0

We add all the numbers together, and all the variables

2X-210=0

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

2X=210

X=210/2

X=105

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