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-5(4-r)=10
We move all terms to the left:
-5(4-r)-(10)=0
We add all the numbers together, and all the variables
-5(-1r+4)-10=0
We multiply parentheses
5r-20-10=0
We add all the numbers together, and all the variables
5r-30=0
We move all terms containing r to the left, all other terms to the right
5r=30
r=30/5
r=6
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