Final answer:
To solve the equation r + 2 = 231 + 2r + 0.42, combine like terms and isolate r.
Step-by-step explanation:
To solve the equation r + 2 = 231 + 2r + 0.42, we need to simplify it first. We can start by combining like terms.
r + 2r = 231 + 0.42 - 2
3r = 231.42 - 2
3r = 229.42
To isolate r, we divide both sides of the equation by 3.
r = 229.42/3
r ≈ 76.473