200=100-25a

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Solution for 200=100-25a equation: 



200=100-25a

We move all terms to the left:

200-(100-25a)=0

We add all the numbers together, and all the variables

-(-25a+100)+200=0

We get rid of parentheses

25a-100+200=0

We add all the numbers together, and all the variables

25a+100=0

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

25a=-100

a=-100/25

a=-4

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