Solve 10x + 7 = −43

The solution of 10x + 7 = −43 is x = -5.

10x + 7 = -43\ \Rightarrow\ x = -5

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The lines y = 10x + 7 and y = -43 meet at x = -5. 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.
$10x + 7 = -43$
2
Subtract 7 from both sides:
$10x + 7 - 7 = -43 - 7 \ \Rightarrow\ 10x = -50$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{-50}{10} \ \Rightarrow\ x = -5$
4
Check: put x = -5 back into the equation.
$10\cdot(-5) + 7 = -50 + 7 = -43 \checkmark$

LaTeX source of the formulas on this page

\[ 10x + 7 = -43\ \Rightarrow\ x = -5 \]
\[ 10x + 7 = -43 \]
\[ 10x + 7 - 7 = -43 - 7 \ \Rightarrow\ 10x = -50 \]
\[ \frac{10x}{10} = \frac{-50}{10} \ \Rightarrow\ x = -5 \]
\[ 10\cdot(-5) + 7 = -50 + 7 = -43 \checkmark \]

Trying values of x in 10x + 7 = −43

x	10x + 7	Equals -43?
-7	-63	no
-6	-53	no
-5	-43	yes
-4	-33	no
-3	-23	no

Questions

What is x in 10x + 7 = −43?

The solution of 10x + 7 = −43 is x = -5.

How do you solve 10x + 7 = −43?

Subtract 7 from both sides to get 10x = -50, then divide both sides by 10 to get x = -5.

How do I check the answer?

Replace x by -5: 10(-5) + 7 = -43, which is -43.

Solve 10x + 7 = −43

How to work it out

Trying values of x in 10x + 7 = −43

Questions

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