Solve 12x + 6 = −30

The solution of 12x + 6 = −30 is x = -3.

12x + 6 = -30\ \Rightarrow\ x = -3

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The lines y = 12x + 6 and y = -30 meet at x = -3. 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 addition, then the multiplication.
$12x + 6 = -30$
2
Subtract 6 from both sides:
$12x + 6 - 6 = -30 - 6 \ \Rightarrow\ 12x = -36$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{-36}{12} \ \Rightarrow\ x = -3$
4
Check: put x = -3 back into the equation.
$12\cdot(-3) + 6 = -36 + 6 = -30 \checkmark$

LaTeX source of the formulas on this page

\[ 12x + 6 = -30\ \Rightarrow\ x = -3 \]
\[ 12x + 6 = -30 \]
\[ 12x + 6 - 6 = -30 - 6 \ \Rightarrow\ 12x = -36 \]
\[ \frac{12x}{12} = \frac{-36}{12} \ \Rightarrow\ x = -3 \]
\[ 12\cdot(-3) + 6 = -36 + 6 = -30 \checkmark \]

Trying values of x in 12x + 6 = −30

x	12x + 6	Equals -30?
-5	-54	no
-4	-42	no
-3	-30	yes
-2	-18	no
-1	-6	no

Questions

What is x in 12x + 6 = −30?

The solution of 12x + 6 = −30 is x = -3.

How do you solve 12x + 6 = −30?

Subtract 6 from both sides to get 12x = -36, then divide both sides by 12 to get x = -3.

How do I check the answer?

Replace x by -3: 12(-3) + 6 = -30, which is -30.

Solve 12x + 6 = −30

How to work it out

Trying values of x in 12x + 6 = −30

Questions

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