Solve 3x − 12 = −12

The solution of 3x − 12 = −12 is x = 0.

3x - 12 = -12\ \Rightarrow\ x = 0

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The lines y = 3x − 12 and y = -12 meet at x = 0. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$3x - 12 = -12$
2
Add 12 to both sides:
$3x - 12 + 12 = -12 + 12 \ \Rightarrow\ 3x = 0$
3
Divide both sides by 3:
$\frac{3x}{3} = \frac{0}{3} \ \Rightarrow\ x = 0$
4
Check: put x = 0 back into the equation.
$3\cdot0 - 12 = 0 - 12 = -12 \checkmark$

LaTeX source of the formulas on this page

\[ 3x - 12 = -12\ \Rightarrow\ x = 0 \]
\[ 3x - 12 = -12 \]
\[ 3x - 12 + 12 = -12 + 12 \ \Rightarrow\ 3x = 0 \]
\[ \frac{3x}{3} = \frac{0}{3} \ \Rightarrow\ x = 0 \]
\[ 3\cdot0 - 12 = 0 - 12 = -12 \checkmark \]

Trying values of x in 3x − 12 = −12

x	3x − 12	Equals -12?
-2	-18	no
-1	-15	no
0	-12	yes
1	-9	no
2	-6	no

Questions

What is x in 3x − 12 = −12?

The solution of 3x − 12 = −12 is x = 0.

How do you solve 3x − 12 = −12?

Add 12 to both sides to get 3x = 0, then divide both sides by 3 to get x = 0.

How do I check the answer?

Replace x by 0: 3(0) − 12 = -12, which is -12.

Solve 3x − 12 = −12

How to work it out

Trying values of x in 3x − 12 = −12

Questions

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