Solve 7x − 7 = 63

The solution of 7x − 7 = 63 is x = 10.

7x - 7 = 63\ \Rightarrow\ x = 10

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The lines y = 7x − 7 and y = 63 meet at x = 10. 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.
$7x - 7 = 63$
2
Add 7 to both sides:
$7x - 7 + 7 = 63 + 7 \ \Rightarrow\ 7x = 70$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{70}{7} \ \Rightarrow\ x = 10$
4
Check: put x = 10 back into the equation.
$7\cdot10 - 7 = 70 - 7 = 63 \checkmark$

LaTeX source of the formulas on this page

\[ 7x - 7 = 63\ \Rightarrow\ x = 10 \]
\[ 7x - 7 = 63 \]
\[ 7x - 7 + 7 = 63 + 7 \ \Rightarrow\ 7x = 70 \]
\[ \frac{7x}{7} = \frac{70}{7} \ \Rightarrow\ x = 10 \]
\[ 7\cdot10 - 7 = 70 - 7 = 63 \checkmark \]

Trying values of x in 7x − 7 = 63

x	7x − 7	Equals 63?
8	49	no
9	56	no
10	63	yes
11	70	no
12	77	no

Questions

What is x in 7x − 7 = 63?

The solution of 7x − 7 = 63 is x = 10.

How do you solve 7x − 7 = 63?

Add 7 to both sides to get 7x = 70, then divide both sides by 7 to get x = 10.

How do I check the answer?

Replace x by 10: 7(10) − 7 = 63, which is 63.

Solve 7x − 7 = 63

How to work it out

Trying values of x in 7x − 7 = 63

Questions

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