When a plant was purchased, it was \(1.2\) inches tall. It grows \(0.2\) inches per day. How many days later will the plant be \(5.2\) inches tall?
Assume the plant will be \(5.2\) inches tall \(d\) days later. We can solve this problem using the equation:
Check whether \(21\) is a solution for \(d\) of this equation.