Question

Solve the equation. Check your solution. 21 = 4x - 9 - x

Equations and inequalities
Solve the equation. Check your solution. 21 = 4x - 9 - x

2020-12-18
Given equation:
21=4x-9-x
21=3x-9
add 9 to both sides of the equation to isolate the variable term:
21+9=3x-9+9
3x=30
divide both sides by 3
$$(3x)/(3)=(30)/(3)$$
x=10