Solve 6x − 6 = 90

The solution of 6x − 6 = 90 is x = 16.

6x - 6 = 90\ \Rightarrow\ x = 16

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The lines y = 6x − 6 and y = 90 meet at x = 16. 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.
$6x - 6 = 90$
2
Add 6 to both sides:
$6x - 6 + 6 = 90 + 6 \ \Rightarrow\ 6x = 96$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{96}{6} \ \Rightarrow\ x = 16$
4
Check: put x = 16 back into the equation.
$6\cdot16 - 6 = 96 - 6 = 90 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 6 = 90\ \Rightarrow\ x = 16 \]
\[ 6x - 6 = 90 \]
\[ 6x - 6 + 6 = 90 + 6 \ \Rightarrow\ 6x = 96 \]
\[ \frac{6x}{6} = \frac{96}{6} \ \Rightarrow\ x = 16 \]
\[ 6\cdot16 - 6 = 96 - 6 = 90 \checkmark \]

Trying values of x in 6x − 6 = 90

x	6x − 6	Equals 90?
14	78	no
15	84	no
16	90	yes
17	96	no
18	102	no

Questions

What is x in 6x − 6 = 90?

The solution of 6x − 6 = 90 is x = 16.

How do you solve 6x − 6 = 90?

Add 6 to both sides to get 6x = 96, then divide both sides by 6 to get x = 16.

How do I check the answer?

Replace x by 16: 6(16) − 6 = 90, which is 90.

Solve 6x − 6 = 90

How to work it out

Trying values of x in 6x − 6 = 90

Questions

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