20r-100=40

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Solution for 20r-100=40 equation: 



20r-100=40

We move all terms to the left:

20r-100-(40)=0

We add all the numbers together, and all the variables

20r-140=0

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

20r=140

r=140/20

r=7

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