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4(r+5)=-13
We move all terms to the left:
4(r+5)-(-13)=0
We add all the numbers together, and all the variables
4(r+5)+13=0
We multiply parentheses
4r+20+13=0
We add all the numbers together, and all the variables
4r+33=0
We move all terms containing r to the left, all other terms to the right
4r=-33
r=-33/4
r=-8+1/4
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