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5r-6r-3r=21-16+13
We move all terms to the left:
5r-6r-3r-(21-16+13)=0
We add all the numbers together, and all the variables
5r-6r-3r-18=0
We add all the numbers together, and all the variables
-4r-18=0
We move all terms containing r to the left, all other terms to the right
-4r=18
r=18/-4
r=-4+1/2
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