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19-11r/13=4
We move all terms to the left:
19-11r/13-(4)=0
We add all the numbers together, and all the variables
-11r/13+15=0
We multiply all the terms by the denominator
-11r+15*13=0
We add all the numbers together, and all the variables
-11r+195=0
We move all terms containing r to the left, all other terms to the right
-11r=-195
r=-195/-11
r=17+8/11
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