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7-2r/3=4r
We move all terms to the left:
7-2r/3-(4r)=0
We add all the numbers together, and all the variables
-4r-2r/3+7=0
We multiply all the terms by the denominator
-4r*3-2r+7*3=0
We add all the numbers together, and all the variables
-2r-4r*3+21=0
Wy multiply elements
-2r-12r+21=0
We add all the numbers together, and all the variables
-14r+21=0
We move all terms containing r to the left, all other terms to the right
-14r=-21
r=-21/-14
r=1+1/2
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