200=300-2a

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Solution for 200=300-2a equation: 



200=300-2a

We move all terms to the left:

200-(300-2a)=0

We add all the numbers together, and all the variables

-(-2a+300)+200=0

We get rid of parentheses

2a-300+200=0

We add all the numbers together, and all the variables

2a-100=0

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

2a=100

a=100/2

a=50

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