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Solve 7x + 5 = 145

The solution of 7x + 5 = 145 is x = 20.

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The lines y = 7x + 5 and y = 145 meet at x = 2014161820222426100120140160180x = 20y = 7x + 5y = 145
The lines y = 7x + 5 and y = 145 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+5=1457x + 5 = 145
  2. 2

    Subtract 5 from both sides:

    7x+5−5=145−5 ⇒ 7x=1407x + 5 - 5 = 145 - 5 \ \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+5=140+5=145✓7\cdot20 + 5 = 140 + 5 = 145 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 5 = 145\ \Rightarrow\ x = 20 \]
\[ 7x + 5 = 145 \]
\[ 7x + 5 - 5 = 145 - 5 \ \Rightarrow\ 7x = 140 \]
\[ \frac{7x}{7} = \frac{140}{7} \ \Rightarrow\ x = 20 \]
\[ 7\cdot20 + 5 = 140 + 5 = 145 \checkmark \]

Trying values of x in 7x + 5 = 145

x7x + 5Equals 145?
18131no
19138no
20145yes
21152no
22159no

Questions

What is x in 7x + 5 = 145?

The solution of 7x + 5 = 145 is x = 20.

How do you solve 7x + 5 = 145?

Subtract 5 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) + 5 = 145, which is 145.

Similar equations

    Solve 7x + 5 = 145: x = 20 (steps and check) | WordGPT