Solve 6x − 9 = 105

The solution of 6x − 9 = 105 is x = 19.

6x - 9 = 105\ \Rightarrow\ x = 19

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The lines y = 6x − 9 and y = 105 meet at x = 19. 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.
$6x - 9 = 105$
2
Add 9 to both sides:
$6x - 9 + 9 = 105 + 9 \ \Rightarrow\ 6x = 114$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{114}{6} \ \Rightarrow\ x = 19$
4
Check: put x = 19 back into the equation.
$6\cdot19 - 9 = 114 - 9 = 105 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 9 = 105\ \Rightarrow\ x = 19 \]
\[ 6x - 9 = 105 \]
\[ 6x - 9 + 9 = 105 + 9 \ \Rightarrow\ 6x = 114 \]
\[ \frac{6x}{6} = \frac{114}{6} \ \Rightarrow\ x = 19 \]
\[ 6\cdot19 - 9 = 114 - 9 = 105 \checkmark \]

Trying values of x in 6x − 9 = 105

x	6x − 9	Equals 105?
17	93	no
18	99	no
19	105	yes
20	111	no
21	117	no

Questions

What is x in 6x − 9 = 105?

The solution of 6x − 9 = 105 is x = 19.

How do you solve 6x − 9 = 105?

Add 9 to both sides to get 6x = 114, then divide both sides by 6 to get x = 19.

How do I check the answer?

Replace x by 19: 6(19) − 9 = 105, which is 105.

Solve 6x − 9 = 105

How to work it out

Trying values of x in 6x − 9 = 105

Questions

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