Question

Solve for the unknown in the equation
3(x-1)=21

Answer 1

x = 8

Explanation:

First distribute

then +3 to both sides

which becomes 3x = 21

then divide both sides by 3 to get X by itself

Answer 2

6

Explanation:

The main idea of how to solve it is to isolate the variable. Whatever you multiply, divide, add, or subtract on one side, you must do the same to the other side so that both sides are equal.

3(x-1) = 21

3(x-1) / 3 = 21 / 3

x - 1 = 7

+ 1 + 1

x = 6