Solve 7x − 8 = −29

The solution of 7x − 8 = −29 is x = -3.

7x - 8 = -29\ \Rightarrow\ x = -3

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The lines y = 7x − 8 and y = -29 meet at x = -3. 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.
$7x - 8 = -29$
2
Add 8 to both sides:
$7x - 8 + 8 = -29 + 8 \ \Rightarrow\ 7x = -21$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{-21}{7} \ \Rightarrow\ x = -3$
4
Check: put x = -3 back into the equation.
$7\cdot(-3) - 8 = -21 - 8 = -29 \checkmark$

LaTeX source of the formulas on this page

\[ 7x - 8 = -29\ \Rightarrow\ x = -3 \]
\[ 7x - 8 = -29 \]
\[ 7x - 8 + 8 = -29 + 8 \ \Rightarrow\ 7x = -21 \]
\[ \frac{7x}{7} = \frac{-21}{7} \ \Rightarrow\ x = -3 \]
\[ 7\cdot(-3) - 8 = -21 - 8 = -29 \checkmark \]

Trying values of x in 7x − 8 = −29

x	7x − 8	Equals -29?
-5	-43	no
-4	-36	no
-3	-29	yes
-2	-22	no
-1	-15	no

Questions

What is x in 7x − 8 = −29?

The solution of 7x − 8 = −29 is x = -3.

How do you solve 7x − 8 = −29?

Add 8 to both sides to get 7x = -21, then divide both sides by 7 to get x = -3.

How do I check the answer?

Replace x by -3: 7(-3) − 8 = -29, which is -29.

Solve 7x − 8 = −29

How to work it out

Trying values of x in 7x − 8 = −29

Questions

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