0=400+100a

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Solution for 0=400+100a equation: 



0=400+100a

We move all terms to the left:

0-(400+100a)=0

We add all the numbers together, and all the variables

-(100a+400)+0=0

We add all the numbers together, and all the variables

-(100a+400)=0

We get rid of parentheses

-100a-400=0

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

-100a=400

a=400/-100

a=-4

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