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78=5r+28
We move all terms to the left:
78-(5r+28)=0
We get rid of parentheses
-5r-28+78=0
We add all the numbers together, and all the variables
-5r+50=0
We move all terms containing r to the left, all other terms to the right
-5r=-50
r=-50/-5
r=+10
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