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Solve 3x + 4 = 55

The solution of 3x + 4 = 55 is x = 17.

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The lines y = 3x + 4 and y = 55 meet at x = 17121416182022354045505560657075x = 17y = 3x + 4y = 55
The lines y = 3x + 4 and y = 55 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.

    3x+4=553x + 4 = 55
  2. 2

    Subtract 4 from both sides:

    3x+4−4=55−4 ⇒ 3x=513x + 4 - 4 = 55 - 4 \ \Rightarrow\ 3x = 51
  3. 3

    Divide both sides by 3:

    3x3=513 ⇒ x=17\frac{3x}{3} = \frac{51}{3} \ \Rightarrow\ x = 17
  4. 4

    Check: put x = 17 back into the equation.

    3⋅17+4=51+4=55✓3\cdot17 + 4 = 51 + 4 = 55 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 4 = 55\ \Rightarrow\ x = 17 \]
\[ 3x + 4 = 55 \]
\[ 3x + 4 - 4 = 55 - 4 \ \Rightarrow\ 3x = 51 \]
\[ \frac{3x}{3} = \frac{51}{3} \ \Rightarrow\ x = 17 \]
\[ 3\cdot17 + 4 = 51 + 4 = 55 \checkmark \]

Trying values of x in 3x + 4 = 55

x3x + 4Equals 55?
1549no
1652no
1755yes
1858no
1961no

Questions

What is x in 3x + 4 = 55?

The solution of 3x + 4 = 55 is x = 17.

How do you solve 3x + 4 = 55?

Subtract 4 from both sides to get 3x = 51, then divide both sides by 3 to get x = 17.

How do I check the answer?

Replace x by 17: 3(17) + 4 = 55, which is 55.

Similar equations

    Solve 3x + 4 = 55: x = 17 (steps and check) | WordGPT