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9/7r-21=14/7r
We move all terms to the left:
9/7r-21-(14/7r)=0
Domain of the equation: 7r!=0
r!=0/7
r!=0
r∈R
Domain of the equation: 7r)!=0We add all the numbers together, and all the variables
r!=0/1
r!=0
r∈R
9/7r-(+14/7r)-21=0
We get rid of parentheses
9/7r-14/7r-21=0
We multiply all the terms by the denominator
-21*7r+9-14=0
We add all the numbers together, and all the variables
-21*7r-5=0
Wy multiply elements
-147r-5=0
We move all terms containing r to the left, all other terms to the right
-147r=5
r=5/-147
r=-5/147
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