Solve 12x − 12 = 228

The solution of 12x − 12 = 228 is x = 20.

12x - 12 = 228\ \Rightarrow\ x = 20

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The lines y = 12x − 12 and y = 228 meet at x = 20. 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.
$12x - 12 = 228$
2
Add 12 to both sides:
$12x - 12 + 12 = 228 + 12 \ \Rightarrow\ 12x = 240$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{240}{12} \ \Rightarrow\ x = 20$
4
Check: put x = 20 back into the equation.
$12\cdot20 - 12 = 240 - 12 = 228 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 12 = 228\ \Rightarrow\ x = 20 \]
\[ 12x - 12 = 228 \]
\[ 12x - 12 + 12 = 228 + 12 \ \Rightarrow\ 12x = 240 \]
\[ \frac{12x}{12} = \frac{240}{12} \ \Rightarrow\ x = 20 \]
\[ 12\cdot20 - 12 = 240 - 12 = 228 \checkmark \]

Trying values of x in 12x − 12 = 228

x	12x − 12	Equals 228?
18	204	no
19	216	no
20	228	yes
21	240	no
22	252	no

Questions

What is x in 12x − 12 = 228?

The solution of 12x − 12 = 228 is x = 20.

How do you solve 12x − 12 = 228?

Add 12 to both sides to get 12x = 240, then divide both sides by 12 to get x = 20.

How do I check the answer?

Replace x by 20: 12(20) − 12 = 228, which is 228.

Solve 12x − 12 = 228

How to work it out

Trying values of x in 12x − 12 = 228

Questions

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