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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+10=0
We move all terms containing r to the left, all other terms to the right
-5r=-10
r=-10/-5
r=+2
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