WordGPT

Solve 7x + 7 = 28

The solution of 7x + 7 = 28 is x = 3.

Explain it step by step in chatMake a short video of it
The lines y = 7x + 7 and y = 28 meet at x = 3-22468-20204060x = 3y = 7x + 7y = 28
The lines y = 7x + 7 and y = 28 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. 1

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

    7x+7=287x + 7 = 28
  2. 2

    Subtract 7 from both sides:

    7x+7−7=28−7 ⇒ 7x=217x + 7 - 7 = 28 - 7 \ \Rightarrow\ 7x = 21
  3. 3

    Divide both sides by 7:

    7x7=217 ⇒ x=3\frac{7x}{7} = \frac{21}{7} \ \Rightarrow\ x = 3
  4. 4

    Check: put x = 3 back into the equation.

    7⋅3+7=21+7=28✓7\cdot3 + 7 = 21 + 7 = 28 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 7 = 28\ \Rightarrow\ x = 3 \]
\[ 7x + 7 = 28 \]
\[ 7x + 7 - 7 = 28 - 7 \ \Rightarrow\ 7x = 21 \]
\[ \frac{7x}{7} = \frac{21}{7} \ \Rightarrow\ x = 3 \]
\[ 7\cdot3 + 7 = 21 + 7 = 28 \checkmark \]

Trying values of x in 7x + 7 = 28

x7x + 7Equals 28?
114no
221no
328yes
435no
542no

Questions

What is x in 7x + 7 = 28?

The solution of 7x + 7 = 28 is x = 3.

How do you solve 7x + 7 = 28?

Subtract 7 from 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) + 7 = 28, which is 28.

Similar equations

    Solve 7x + 7 = 28: x = 3 (steps and check) | WordGPT