# How do you solve 4x - 9=51?

Mar 19, 2018

x=15

#### Explanation:

Isolate the variable, then get rid of any coefficients

$4 x - 9 = 51$

$4 x = 60$

$x = 15$

Mar 19, 2018

#### Explanation:

You do the inverse operation of the 9 and add it to the 51 giving you 60 then just divide and you get your answer 15

Mar 19, 2018

$x = 15$

#### Explanation:

$4 x - 9 = 51$

Add $9$ to each side to get the $4 x$ by itself.

$4 x - 9 + 9 = 51 + 9$

$4 x = 60$

Then divide by $4$ on each side

$\frac{4 x}{4} = \frac{60}{4}$

$x = 15$

Mar 19, 2018

See a solution process below:

#### Explanation:

First, add $\textcolor{red}{9}$ to each side of the equation to isolate the $x$ term while keeping the equation balanced:

$4 x - 9 + \textcolor{red}{9} = 51 + \textcolor{red}{9}$

$4 x - 0 = 60$

$4 x = 60$

Now, divide each side of the equation by $\textcolor{red}{4}$ to solve for $x$ while keeping the equation balanced:

$\frac{4 x}{\textcolor{red}{4}} = \frac{60}{\textcolor{red}{4}}$

$\frac{\textcolor{red}{\cancel{\textcolor{b l a c k}{4}}} x}{\cancel{\textcolor{red}{4}}} = 15$

$x = 15$