Answer:
<h3>The value of the unknown (x) is equal to 5</h3>
Step-by-step explanation:
To find the value of x, we follow these steps:
<em>To solve an equation that is not simplified, what we have to do first is simplify it.</em><em> </em><em>We have to group all the similar terms, in this case, there is only one unknown, so we will have to simplify that:</em>

<em>Now when a term is adding, we must go to the other side of the equality to subtract from the other equal term</em><em> </em><em>In this case, +5 is adding, so we must go to the other side of the equal to do the opposite: Subtract this </em><em>to</em><em> 25</em><em>:</em>

<em>Continuing with the opposite operations, we see that 4 multiplies the unknown, so we must go to the other side of the equal to divide 20/4, as follows:</em>
<em>
</em>
So:
<h3>
The value of the unknown (x) is equal to 5</h3>