-r-14r=105

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Solution for -r-14r=105 equation: 



-r-14r=105

We move all terms to the left:

-r-14r-(105)=0

We add all the numbers together, and all the variables

-15r-105=0

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

-15r=105

r=105/-15

r=-7

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