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18r-15+2r=3\left(r-5\right)-5r
Use the distributive property to multiply 3 by 6r-5.
20r-15=3\left(r-5\right)-5r
Combine 18r and 2r to get 20r.
20r-15=3r-15-5r
Use the distributive property to multiply 3 by r-5.
20r-15=-2r-15
Combine 3r and -5r to get -2r.
20r-15+2r=-15
Add 2r to both sides.
22r-15=-15
Combine 20r and 2r to get 22r.
22r=-15+15
Add 15 to both sides.
22r=0
Add -15 and 15 to get 0.
r=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 22 is not equal to 0, r must be equal to 0.