50r=100(r-2)

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Solution for 50r=100(r-2) equation: 



50r=100(r-2)

We move all terms to the left:

50r-(100(r-2))=0



We calculate terms in parentheses: -(100(r-2)), so:

100(r-2)

We multiply parentheses

100r-200

Back to the equation:

-(100r-200)



We get rid of parentheses

50r-100r+200=0

We add all the numbers together, and all the variables

-50r+200=0

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

-50r=-200

r=-200/-50

r=+4

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