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Solve 7x + 3 = 143

The solution of 7x + 3 = 143 is x = 20.

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The lines y = 7x + 3 and y = 143 meet at x = 2014161820222426100120140160180x = 20y = 7x + 3y = 143
The lines y = 7x + 3 and y = 143 meet at x = 20. 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+3=1437x + 3 = 143
  2. 2

    Subtract 3 from both sides:

    7x+3−3=143−3 ⇒ 7x=1407x + 3 - 3 = 143 - 3 \ \Rightarrow\ 7x = 140
  3. 3

    Divide both sides by 7:

    7x7=1407 ⇒ x=20\frac{7x}{7} = \frac{140}{7} \ \Rightarrow\ x = 20
  4. 4

    Check: put x = 20 back into the equation.

    7⋅20+3=140+3=143✓7\cdot20 + 3 = 140 + 3 = 143 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 3 = 143\ \Rightarrow\ x = 20 \]
\[ 7x + 3 = 143 \]
\[ 7x + 3 - 3 = 143 - 3 \ \Rightarrow\ 7x = 140 \]
\[ \frac{7x}{7} = \frac{140}{7} \ \Rightarrow\ x = 20 \]
\[ 7\cdot20 + 3 = 140 + 3 = 143 \checkmark \]

Trying values of x in 7x + 3 = 143

x7x + 3Equals 143?
18129no
19136no
20143yes
21150no
22157no

Questions

What is x in 7x + 3 = 143?

The solution of 7x + 3 = 143 is x = 20.

How do you solve 7x + 3 = 143?

Subtract 3 from both sides to get 7x = 140, then divide both sides by 7 to get x = 20.

How do I check the answer?

Replace x by 20: 7(20) + 3 = 143, which is 143.

Similar equations

    Solve 7x + 3 = 143: x = 20 (steps and check) | WordGPT