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Solve 7x + 3 = 66

The solution of 7x + 3 = 66 is x = 9.

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The lines y = 7x + 3 and y = 66 meet at x = 946810121420406080100x = 9y = 7x + 3y = 66
The lines y = 7x + 3 and y = 66 meet at x = 9. 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=667x + 3 = 66
  2. 2

    Subtract 3 from both sides:

    7x+3−3=66−3 ⇒ 7x=637x + 3 - 3 = 66 - 3 \ \Rightarrow\ 7x = 63
  3. 3

    Divide both sides by 7:

    7x7=637 ⇒ x=9\frac{7x}{7} = \frac{63}{7} \ \Rightarrow\ x = 9
  4. 4

    Check: put x = 9 back into the equation.

    7⋅9+3=63+3=66✓7\cdot9 + 3 = 63 + 3 = 66 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 3 = 66\ \Rightarrow\ x = 9 \]
\[ 7x + 3 = 66 \]
\[ 7x + 3 - 3 = 66 - 3 \ \Rightarrow\ 7x = 63 \]
\[ \frac{7x}{7} = \frac{63}{7} \ \Rightarrow\ x = 9 \]
\[ 7\cdot9 + 3 = 63 + 3 = 66 \checkmark \]

Trying values of x in 7x + 3 = 66

x7x + 3Equals 66?
752no
859no
966yes
1073no
1180no

Questions

What is x in 7x + 3 = 66?

The solution of 7x + 3 = 66 is x = 9.

How do you solve 7x + 3 = 66?

Subtract 3 from both sides to get 7x = 63, then divide both sides by 7 to get x = 9.

How do I check the answer?

Replace x by 9: 7(9) + 3 = 66, which is 66.

Similar equations

    Solve 7x + 3 = 66: x = 9 (steps and check) | WordGPT