Solve 7x + 15 = −41

The solution of 7x + 15 = −41 is x = -8.

7x + 15 = -41\ \Rightarrow\ x = -8

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The lines y = 7x + 15 and y = -41 meet at x = -8. 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 addition, then the multiplication.
$7x + 15 = -41$
2
Subtract 15 from both sides:
$7x + 15 - 15 = -41 - 15 \ \Rightarrow\ 7x = -56$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{-56}{7} \ \Rightarrow\ x = -8$
4
Check: put x = -8 back into the equation.
$7\cdot(-8) + 15 = -56 + 15 = -41 \checkmark$

LaTeX source of the formulas on this page

\[ 7x + 15 = -41\ \Rightarrow\ x = -8 \]
\[ 7x + 15 = -41 \]
\[ 7x + 15 - 15 = -41 - 15 \ \Rightarrow\ 7x = -56 \]
\[ \frac{7x}{7} = \frac{-56}{7} \ \Rightarrow\ x = -8 \]
\[ 7\cdot(-8) + 15 = -56 + 15 = -41 \checkmark \]

Trying values of x in 7x + 15 = −41

x	7x + 15	Equals -41?
-10	-55	no
-9	-48	no
-8	-41	yes
-7	-34	no
-6	-27	no

Questions

What is x in 7x + 15 = −41?

The solution of 7x + 15 = −41 is x = -8.

How do you solve 7x + 15 = −41?

Subtract 15 from both sides to get 7x = -56, then divide both sides by 7 to get x = -8.

How do I check the answer?

Replace x by -8: 7(-8) + 15 = -41, which is -41.

Solve 7x + 15 = −41

How to work it out

Trying values of x in 7x + 15 = −41

Questions

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