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5(-7r+2)-2r=40-7r
We move all terms to the left:
5(-7r+2)-2r-(40-7r)=0
We add all the numbers together, and all the variables
5(-7r+2)-2r-(-7r+40)=0
We add all the numbers together, and all the variables
-2r+5(-7r+2)-(-7r+40)=0
We multiply parentheses
-2r-35r-(-7r+40)+10=0
We get rid of parentheses
-2r-35r+7r-40+10=0
We add all the numbers together, and all the variables
-30r-30=0
We move all terms containing r to the left, all other terms to the right
-30r=30
r=30/-30
r=-1
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