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-4(r+-5)=16
We move all terms to the left:
-4(r+-5)-(16)=0
We add all the numbers together, and all the variables
-4(r-5)-16=0
We multiply parentheses
-4r+20-16=0
We add all the numbers together, and all the variables
-4r+4=0
We move all terms containing r to the left, all other terms to the right
-4r=-4
r=-4/-4
r=1
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