(17-12)-(-a)=125-250

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Solution for (17-12)-(-a)=125-250 equation: 



(17-12)-(-a)=125-250

We move all terms to the left:

(17-12)-(-a)-(125-250)=0

We add all the numbers together, and all the variables

-(-1a)+5-(-125)=0

We add all the numbers together, and all the variables

-(-1a)+130=0

We get rid of parentheses

1a+130=0

We add all the numbers together, and all the variables

a+130=0

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

a=-130

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