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7-r=1/3(54r-36)
We move all terms to the left:
7-r-(1/3(54r-36))=0
Domain of the equation: 3(54r-36))!=0We add all the numbers together, and all the variables
r∈R
-1r-(1/3(54r-36))+7=0
We multiply all the terms by the denominator
-1r*3(54r-36))-(1+7*3(54r-36))=0
Wy multiply elements
-3r^2(5+21r(5=0
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