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r+(r/2)+(r-5)=40
We move all terms to the left:
r+(r/2)+(r-5)-(40)=0
We add all the numbers together, and all the variables
r+(+r/2)+(r-5)-40=0
We get rid of parentheses
r+r/2+r-5-40=0
We multiply all the terms by the denominator
r*2+r+r*2-5*2-40*2=0
We add all the numbers together, and all the variables
r+r*2+r*2-90=0
Wy multiply elements
r+2r+2r-90=0
We add all the numbers together, and all the variables
5r-90=0
We move all terms containing r to the left, all other terms to the right
5r=90
r=90/5
r=18
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