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5-4(5r-2)=-107
We move all terms to the left:
5-4(5r-2)-(-107)=0
We add all the numbers together, and all the variables
-4(5r-2)+112=0
We multiply parentheses
-20r+8+112=0
We add all the numbers together, and all the variables
-20r+120=0
We move all terms containing r to the left, all other terms to the right
-20r=-120
r=-120/-20
r=+6
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