QuestionAugust 24, 2025

Solve the equation. -12+21=-3(x+4) x= square

Solve the equation. -12+21=-3(x+4) x= square
Solve the equation.
-12+21=-3(x+4)
x= square

Solution
4.2(272 votes)

Answer

x = -7 Explanation 1. Simplify the equation Distribute -3 on the right side: -3(x+4) = -3x - 12. 2. Combine like terms The equation becomes -12 + 21 = -3x - 12. Simplify the left side: 9 = -3x - 12. 3. Isolate x Add 12 to both sides: 9 + 12 = -3x, which simplifies to 21 = -3x. 4. Solve for x Divide both sides by -3: x = \frac{21}{-3}.

Explanation

1. Simplify the equation<br /> Distribute $-3$ on the right side: $-3(x+4) = -3x - 12$.<br />2. Combine like terms<br /> The equation becomes $-12 + 21 = -3x - 12$. Simplify the left side: $9 = -3x - 12$.<br />3. Isolate $x$<br /> Add $12$ to both sides: $9 + 12 = -3x$, which simplifies to $21 = -3x$.<br />4. Solve for $x$<br /> Divide both sides by $-3$: $x = \frac{21}{-3}$.
Click to rate: