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Solve 2x + 15 = 7

The solution of 2x + 15 = 7 is x = -4.

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The lines y = 2x + 15 and y = 7 meet at x = -4-10-8-6-4-22-55101520x = -4y = 2x + 15y = 7
The lines y = 2x + 15 and y = 7 meet at x = -4. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    2x+15=72x + 15 = 7
  2. 2

    Subtract 15 from both sides:

    2x+15−15=7−15 ⇒ 2x=−82x + 15 - 15 = 7 - 15 \ \Rightarrow\ 2x = -8
  3. 3

    Divide both sides by 2:

    2x2=−82 ⇒ x=−4\frac{2x}{2} = \frac{-8}{2} \ \Rightarrow\ x = -4
  4. 4

    Check: put x = -4 back into the equation.

    2⋅(−4)+15=−8+15=7✓2\cdot(-4) + 15 = -8 + 15 = 7 \checkmark
LaTeX source of the formulas on this page
\[ 2x + 15 = 7\ \Rightarrow\ x = -4 \]
\[ 2x + 15 = 7 \]
\[ 2x + 15 - 15 = 7 - 15 \ \Rightarrow\ 2x = -8 \]
\[ \frac{2x}{2} = \frac{-8}{2} \ \Rightarrow\ x = -4 \]
\[ 2\cdot(-4) + 15 = -8 + 15 = 7 \checkmark \]

Trying values of x in 2x + 15 = 7

x2x + 15Equals 7?
-63no
-55no
-47yes
-39no
-211no

Questions

What is x in 2x + 15 = 7?

The solution of 2x + 15 = 7 is x = -4.

How do you solve 2x + 15 = 7?

Subtract 15 from both sides to get 2x = -8, then divide both sides by 2 to get x = -4.

How do I check the answer?

Replace x by -4: 2(-4) + 15 = 7, which is 7.

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    Solve 2x + 15 = 7: x = -4 (steps and check) | WordGPT