a=a-30+a-50

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Solution for a=a-30+a-50 equation: 



a=a-30+a-50

We move all terms to the left:

a-(a-30+a-50)=0

We add all the numbers together, and all the variables

a-(2a-80)=0

We get rid of parentheses

a-2a+80=0

We add all the numbers together, and all the variables

-1a+80=0

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

-a=-80

a=-80/-1

a=+80

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