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Solve 4x + 4 = 72

The solution of 4x + 4 = 72 is x = 17.

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The lines y = 4x + 4 and y = 72 meet at x = 171214161820225060708090100x = 17y = 4x + 4y = 72
The lines y = 4x + 4 and y = 72 meet at x = 17. 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.

    4x+4=724x + 4 = 72
  2. 2

    Subtract 4 from both sides:

    4x+4−4=72−4 ⇒ 4x=684x + 4 - 4 = 72 - 4 \ \Rightarrow\ 4x = 68
  3. 3

    Divide both sides by 4:

    4x4=684 ⇒ x=17\frac{4x}{4} = \frac{68}{4} \ \Rightarrow\ x = 17
  4. 4

    Check: put x = 17 back into the equation.

    4⋅17+4=68+4=72✓4\cdot17 + 4 = 68 + 4 = 72 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 4 = 72\ \Rightarrow\ x = 17 \]
\[ 4x + 4 = 72 \]
\[ 4x + 4 - 4 = 72 - 4 \ \Rightarrow\ 4x = 68 \]
\[ \frac{4x}{4} = \frac{68}{4} \ \Rightarrow\ x = 17 \]
\[ 4\cdot17 + 4 = 68 + 4 = 72 \checkmark \]

Trying values of x in 4x + 4 = 72

x4x + 4Equals 72?
1564no
1668no
1772yes
1876no
1980no

Questions

What is x in 4x + 4 = 72?

The solution of 4x + 4 = 72 is x = 17.

How do you solve 4x + 4 = 72?

Subtract 4 from both sides to get 4x = 68, then divide both sides by 4 to get x = 17.

How do I check the answer?

Replace x by 17: 4(17) + 4 = 72, which is 72.

Similar equations

    Solve 4x + 4 = 72: x = 17 (steps and check) | WordGPT