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r-10=4+8r
We move all terms to the left:
r-10-(4+8r)=0
We add all the numbers together, and all the variables
r-(8r+4)-10=0
We get rid of parentheses
r-8r-4-10=0
We add all the numbers together, and all the variables
-7r-14=0
We move all terms containing r to the left, all other terms to the right
-7r=14
r=14/-7
r=-2
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