-2.73=-42r

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Solution for -2.73=-42r equation: 



-2.73=-42r

We move all terms to the left:

-2.73-(-42r)=0

We get rid of parentheses

42r-2.73=0

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

42r=2.73

r=2.73/42

r=1/15.384615384615

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