Question

What is the solution set for 7x−3=18 , given the replacement set {0, 1, 2, 3, 4} ? A. x = 0
B.x = 2
C. x = 3
D. x = 4

Answer 1

Move all terms that don't contain x to the right side and solve.
x = 3

Answer 2

Solve for x using inverse operations
Add 3
7x-3+3=18+3
7x=21
Divide 7
7x/7=21/7
x=3
To check-
7(3)-3=18
21-3=18
18=18
The answer is C because it is the solution.