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78/r=13
We move all terms to the left:
78/r-(13)=0
Domain of the equation: r!=0We multiply all the terms by the denominator
r∈R
-13*r+78=0
We add all the numbers together, and all the variables
-13r+78=0
We move all terms containing r to the left, all other terms to the right
-13r=-78
r=-78/-13
r=+6
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