90-10r=100

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Solution for 90-10r=100 equation: 



90-10r=100

We move all terms to the left:

90-10r-(100)=0

We add all the numbers together, and all the variables

-10r-10=0

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

-10r=10

r=10/-10

r=-1

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