amanf

2020-12-17

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

### Answer & Explanation

crocolylec

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
$\frac{3x}{3}=\frac{30}{3}$
x=10

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