90=-10+25a

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Solution for 90=-10+25a equation: 



90=-10+25a

We move all terms to the left:

90-(-10+25a)=0

We add all the numbers together, and all the variables

-(25a-10)+90=0

We get rid of parentheses

-25a+10+90=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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