r=0.7(220-r)

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Solution for r=0.7(220-r) equation: 



r=0.7(220-r)

We move all terms to the left:

r-(0.7(220-r))=0

We add all the numbers together, and all the variables

r-(0.7(-1r+220))=0



We calculate terms in parentheses: -(0.7(-1r+220)), so:

0.7(-1r+220)

We multiply parentheses

-0.7r+154

Back to the equation:

-(-0.7r+154)



We get rid of parentheses

r+0.7r-154=0

We add all the numbers together, and all the variables

1.7r-154=0

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

1.7r=154

r=154/1.7

r=90+1/1.7

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