3r=2.5(100-r)

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Solution for 3r=2.5(100-r) equation: 



3r=2.5(100-r)

We move all terms to the left:

3r-(2.5(100-r))=0

We add all the numbers together, and all the variables

3r-(2.5(-1r+100))=0



We calculate terms in parentheses: -(2.5(-1r+100)), so:

2.5(-1r+100)

We multiply parentheses

-2.5r+250

Back to the equation:

-(-2.5r+250)



We get rid of parentheses

3r+2.5r-250=0

We add all the numbers together, and all the variables

5.5r-250=0

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

5.5r=250

r=250/5.5

r=45+2.5/5.5

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