45-5r=100

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Solution for 45-5r=100 equation: 



45-5r=100

We move all terms to the left:

45-5r-(100)=0

We add all the numbers together, and all the variables

-5r-55=0

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

-5r=55

r=55/-5

r=-11

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