The question is an illustration of solving equations using estimates.
The student's strategy makes sense because he uses estimation to solve the given equation
The correct sequence of equation is as follows:
We have:

Add 0 to the equation

Express 0 as 1 - 1


Add another 0

Express 0 as 3 - 3


Rewrite as:

Solve


Read more about estimation and equations at:
brainly.com/question/18454732
Answer
x≥18
Step-by-step explanation:
X = 13/5 , -7/5
Step by step:
5x-3=10
5x-3=-10
x=13/5
x=-7/5
12/16 can be simplified to 3/4, because 12 and 16 can both be divided 4, 12/4=3, 16/4=4.