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-1+4+8r-6r=3r+7
We move all terms to the left:
-1+4+8r-6r-(3r+7)=0
We add all the numbers together, and all the variables
2r-(3r+7)+3=0
We get rid of parentheses
2r-3r-7+3=0
We add all the numbers together, and all the variables
-1r-4=0
We move all terms containing r to the left, all other terms to the right
-r=4
r=4/-1
r=-4
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