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Solve 3x + 7 = 55

The solution of 3x + 7 = 55 is x = 16.

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The lines y = 3x + 7 and y = 55 meet at x = 1610121416182022354045505560657075x = 16y = 3x + 7y = 55
The lines y = 3x + 7 and y = 55 meet at x = 16. 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.

    3x+7=553x + 7 = 55
  2. 2

    Subtract 7 from both sides:

    3x+7−7=55−7 ⇒ 3x=483x + 7 - 7 = 55 - 7 \ \Rightarrow\ 3x = 48
  3. 3

    Divide both sides by 3:

    3x3=483 ⇒ x=16\frac{3x}{3} = \frac{48}{3} \ \Rightarrow\ x = 16
  4. 4

    Check: put x = 16 back into the equation.

    3⋅16+7=48+7=55✓3\cdot16 + 7 = 48 + 7 = 55 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 7 = 55\ \Rightarrow\ x = 16 \]
\[ 3x + 7 = 55 \]
\[ 3x + 7 - 7 = 55 - 7 \ \Rightarrow\ 3x = 48 \]
\[ \frac{3x}{3} = \frac{48}{3} \ \Rightarrow\ x = 16 \]
\[ 3\cdot16 + 7 = 48 + 7 = 55 \checkmark \]

Trying values of x in 3x + 7 = 55

x3x + 7Equals 55?
1449no
1552no
1655yes
1758no
1861no

Questions

What is x in 3x + 7 = 55?

The solution of 3x + 7 = 55 is x = 16.

How do you solve 3x + 7 = 55?

Subtract 7 from both sides to get 3x = 48, then divide both sides by 3 to get x = 16.

How do I check the answer?

Replace x by 16: 3(16) + 7 = 55, which is 55.

Similar equations

    Solve 3x + 7 = 55: x = 16 (steps and check) | WordGPT