Solve 9x − 3 = −66

The solution of 9x − 3 = −66 is x = -7.

9x - 3 = -66\ \Rightarrow\ x = -7

Explain it step by step in chat Make a short video of it

The lines y = 9x − 3 and y = -66 meet at x = -7. 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.
$9x - 3 = -66$
2
Add 3 to both sides:
$9x - 3 + 3 = -66 + 3 \ \Rightarrow\ 9x = -63$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{-63}{9} \ \Rightarrow\ x = -7$
4
Check: put x = -7 back into the equation.
$9\cdot(-7) - 3 = -63 - 3 = -66 \checkmark$

LaTeX source of the formulas on this page

\[ 9x - 3 = -66\ \Rightarrow\ x = -7 \]
\[ 9x - 3 = -66 \]
\[ 9x - 3 + 3 = -66 + 3 \ \Rightarrow\ 9x = -63 \]
\[ \frac{9x}{9} = \frac{-63}{9} \ \Rightarrow\ x = -7 \]
\[ 9\cdot(-7) - 3 = -63 - 3 = -66 \checkmark \]

Trying values of x in 9x − 3 = −66

x	9x − 3	Equals -66?
-9	-84	no
-8	-75	no
-7	-66	yes
-6	-57	no
-5	-48	no

Questions

What is x in 9x − 3 = −66?

The solution of 9x − 3 = −66 is x = -7.

How do you solve 9x − 3 = −66?

Add 3 to both sides to get 9x = -63, then divide both sides by 9 to get x = -7.

How do I check the answer?

Replace x by -7: 9(-7) − 3 = -66, which is -66.

Solve 9x − 3 = −66

How to work it out

Trying values of x in 9x − 3 = −66

Questions

Similar equations