250-30a=400-50a

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Solution for 250-30a=400-50a equation: 



250-30a=400-50a

We move all terms to the left:

250-30a-(400-50a)=0

We add all the numbers together, and all the variables

-30a-(-50a+400)+250=0

We get rid of parentheses

-30a+50a-400+250=0

We add all the numbers together, and all the variables

20a-150=0

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

20a=150

a=150/20

a=7+1/2

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