Question:
Solution:
According to the picture, we obtain the following equation:
[tex]7x-20\text{ = 3x}[/tex]
this is equivalent to:
[tex]7x-3x\text{ = 20}[/tex]
this is equivalent to:
[tex]4x\text{ = 20}[/tex]
solving for x, we obtain:
[tex]x\text{ = }\frac{20}{4}=5[/tex]
So that, we can conclude that the correct answer is:
[tex]x\text{ = 5}[/tex]
