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4(5+r)=52
We move all terms to the left:
4(5+r)-(52)=0
We add all the numbers together, and all the variables
4(r+5)-52=0
We multiply parentheses
4r+20-52=0
We add all the numbers together, and all the variables
4r-32=0
We move all terms containing r to the left, all other terms to the right
4r=32
r=32/4
r=8
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