Question

solve the equation 4x+9=21​

Answer 1

Step-by-step explanation:

Simplifying

4x + 9 = 21

Reorder the terms:

9 + 4x = 21

Solving

9 + 4x = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.

9 + -9 + 4x = 21 + -9

Combine like terms: 9 + -9 = 0

0 + 4x = 21 + -9

4x = 21 + -9

Combine like terms: 21 + -9 = 12

4x = 12

Divide each side by '4'.

x = 3

Simplifying

x = 3

Answer 2

Answer:

4x+9=21

4x = 21-9

4x = 12

x = 12/4