Solve 7x − 3 = −73

The solution of 7x − 3 = −73 is x = -10.

7x - 3 = -73\ \Rightarrow\ x = -10

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The lines y = 7x − 3 and y = -73 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.
$7x - 3 = -73$
2
Add 3 to both sides:
$7x - 3 + 3 = -73 + 3 \ \Rightarrow\ 7x = -70$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{-70}{7} \ \Rightarrow\ x = -10$
4
Check: put x = -10 back into the equation.
$7\cdot(-10) - 3 = -70 - 3 = -73 \checkmark$

LaTeX source of the formulas on this page

\[ 7x - 3 = -73\ \Rightarrow\ x = -10 \]
\[ 7x - 3 = -73 \]
\[ 7x - 3 + 3 = -73 + 3 \ \Rightarrow\ 7x = -70 \]
\[ \frac{7x}{7} = \frac{-70}{7} \ \Rightarrow\ x = -10 \]
\[ 7\cdot(-10) - 3 = -70 - 3 = -73 \checkmark \]

Trying values of x in 7x − 3 = −73

x	7x − 3	Equals -73?
-12	-87	no
-11	-80	no
-10	-73	yes
-9	-66	no
-8	-59	no

Questions

What is x in 7x − 3 = −73?

The solution of 7x − 3 = −73 is x = -10.

How do you solve 7x − 3 = −73?

Add 3 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) − 3 = -73, which is -73.

Solve 7x − 3 = −73

How to work it out

Trying values of x in 7x − 3 = −73

Questions

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