(225-3a)-a=25

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Solution for (225-3a)-a=25 equation: 



(225-3a)-a=25

We move all terms to the left:

(225-3a)-a-(25)=0

We add all the numbers together, and all the variables

(-3a+225)-a-25=0

We add all the numbers together, and all the variables

-1a+(-3a+225)-25=0

We get rid of parentheses

-1a-3a+225-25=0

We add all the numbers together, and all the variables

-4a+200=0

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

-4a=-200

a=-200/-4

a=+50

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