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Solve 7x + 4 = 39

The solution of 7x + 4 = 39 is x = 5.

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The lines y = 7x + 4 and y = 39 meet at x = 524681020406080x = 5y = 7x + 4y = 39
The lines y = 7x + 4 and y = 39 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. 1

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

    7x+4=397x + 4 = 39
  2. 2

    Subtract 4 from both sides:

    7x+4−4=39−4 ⇒ 7x=357x + 4 - 4 = 39 - 4 \ \Rightarrow\ 7x = 35
  3. 3

    Divide both sides by 7:

    7x7=357 ⇒ x=5\frac{7x}{7} = \frac{35}{7} \ \Rightarrow\ x = 5
  4. 4

    Check: put x = 5 back into the equation.

    7⋅5+4=35+4=39✓7\cdot5 + 4 = 35 + 4 = 39 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 4 = 39\ \Rightarrow\ x = 5 \]
\[ 7x + 4 = 39 \]
\[ 7x + 4 - 4 = 39 - 4 \ \Rightarrow\ 7x = 35 \]
\[ \frac{7x}{7} = \frac{35}{7} \ \Rightarrow\ x = 5 \]
\[ 7\cdot5 + 4 = 35 + 4 = 39 \checkmark \]

Trying values of x in 7x + 4 = 39

x7x + 4Equals 39?
325no
432no
539yes
646no
753no

Questions

What is x in 7x + 4 = 39?

The solution of 7x + 4 = 39 is x = 5.

How do you solve 7x + 4 = 39?

Subtract 4 from both sides to get 7x = 35, then divide both sides by 7 to get x = 5.

How do I check the answer?

Replace x by 5: 7(5) + 4 = 39, which is 39.

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    Solve 7x + 4 = 39: x = 5 (steps and check) | WordGPT