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12-4(8+r)=-20
We move all terms to the left:
12-4(8+r)-(-20)=0
We add all the numbers together, and all the variables
-4(r+8)+12-(-20)=0
We add all the numbers together, and all the variables
-4(r+8)+32=0
We multiply parentheses
-4r-32+32=0
We add all the numbers together, and all the variables
-4r=0
r=0/-4
r=0
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