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16-7/r=21
We move all terms to the left:
16-7/r-(21)=0
Domain of the equation: r!=0We add all the numbers together, and all the variables
r∈R
-7/r-5=0
We multiply all the terms by the denominator
-5*r-7=0
We add all the numbers together, and all the variables
-5r-7=0
We move all terms containing r to the left, all other terms to the right
-5r=7
r=7/-5
r=-1+2/5
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