Solve 11x − 3 = 129

The solution of 11x − 3 = 129 is x = 12.

11x - 3 = 129\ \Rightarrow\ x = 12

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The lines y = 11x − 3 and y = 129 meet at x = 12. 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.
$11x - 3 = 129$
2
Add 3 to both sides:
$11x - 3 + 3 = 129 + 3 \ \Rightarrow\ 11x = 132$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{132}{11} \ \Rightarrow\ x = 12$
4
Check: put x = 12 back into the equation.
$11\cdot12 - 3 = 132 - 3 = 129 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 3 = 129\ \Rightarrow\ x = 12 \]
\[ 11x - 3 = 129 \]
\[ 11x - 3 + 3 = 129 + 3 \ \Rightarrow\ 11x = 132 \]
\[ \frac{11x}{11} = \frac{132}{11} \ \Rightarrow\ x = 12 \]
\[ 11\cdot12 - 3 = 132 - 3 = 129 \checkmark \]

Trying values of x in 11x − 3 = 129

x	11x − 3	Equals 129?
10	107	no
11	118	no
12	129	yes
13	140	no
14	151	no

Questions

What is x in 11x − 3 = 129?

The solution of 11x − 3 = 129 is x = 12.

How do you solve 11x − 3 = 129?

Add 3 to both sides to get 11x = 132, then divide both sides by 11 to get x = 12.

How do I check the answer?

Replace x by 12: 11(12) − 3 = 129, which is 129.

Solve 11x − 3 = 129

How to work it out

Trying values of x in 11x − 3 = 129

Questions

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