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Solve 7x + 13 = 90

The solution of 7x + 13 = 90 is x = 11.

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The lines y = 7x + 13 and y = 90 meet at x = 116810121416406080100120140x = 11y = 7x + 13y = 90
The lines y = 7x + 13 and y = 90 meet at x = 11. 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+13=907x + 13 = 90
  2. 2

    Subtract 13 from both sides:

    7x+13−13=90−13 ⇒ 7x=777x + 13 - 13 = 90 - 13 \ \Rightarrow\ 7x = 77
  3. 3

    Divide both sides by 7:

    7x7=777 ⇒ x=11\frac{7x}{7} = \frac{77}{7} \ \Rightarrow\ x = 11
  4. 4

    Check: put x = 11 back into the equation.

    7⋅11+13=77+13=90✓7\cdot11 + 13 = 77 + 13 = 90 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 13 = 90\ \Rightarrow\ x = 11 \]
\[ 7x + 13 = 90 \]
\[ 7x + 13 - 13 = 90 - 13 \ \Rightarrow\ 7x = 77 \]
\[ \frac{7x}{7} = \frac{77}{7} \ \Rightarrow\ x = 11 \]
\[ 7\cdot11 + 13 = 77 + 13 = 90 \checkmark \]

Trying values of x in 7x + 13 = 90

x7x + 13Equals 90?
976no
1083no
1190yes
1297no
13104no

Questions

What is x in 7x + 13 = 90?

The solution of 7x + 13 = 90 is x = 11.

How do you solve 7x + 13 = 90?

Subtract 13 from both sides to get 7x = 77, then divide both sides by 7 to get x = 11.

How do I check the answer?

Replace x by 11: 7(11) + 13 = 90, which is 90.

Similar equations

    Solve 7x + 13 = 90: x = 11 (steps and check) | WordGPT