200=80+100-5+a-40

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Solution for 200=80+100-5+a-40 equation: 



200=80+100-5+a-40

We move all terms to the left:

200-(80+100-5+a-40)=0

We add all the numbers together, and all the variables

-(a+135)+200=0

We get rid of parentheses

-a-135+200=0

We add all the numbers together, and all the variables

-1a+65=0

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

-a=-65

a=-65/-1

a=+65

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