40-2r=50

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Solution for 40-2r=50 equation: 



40-2r=50

We move all terms to the left:

40-2r-(50)=0

We add all the numbers together, and all the variables

-2r-10=0

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

-2r=10

r=10/-2

r=-5

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