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-8r+8=-4+r+4-5r
We move all terms to the left:
-8r+8-(-4+r+4-5r)=0
We add all the numbers together, and all the variables
-8r-(-4r)+8=0
We get rid of parentheses
-8r+4r+8=0
We add all the numbers together, and all the variables
-4r+8=0
We move all terms containing r to the left, all other terms to the right
-4r=-8
r=-8/-4
r=+2
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