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-8=r/4-10
We move all terms to the left:
-8-(r/4-10)=0
We get rid of parentheses
-r/4+10-8=0
We multiply all the terms by the denominator
-r+10*4-8*4=0
We add all the numbers together, and all the variables
-1r+8=0
We move all terms containing r to the left, all other terms to the right
-r=-8
r=-8/-1
r=+8
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