I'm assuming you want us to solve for the unknown variable z
[tex]10(z-2)=1+4[/tex]
Combine like terms on the right side
[tex]10(z-2)=5[/tex]
Use the distributive property on the left side
[tex]10z-20=5[/tex]
Add both sides by 20 to cancel out the "-20" on the left side
[tex]10z=25[/tex]
Divide both sides by 10
[tex]z=2.5[/tex]
That is the value of the known variable, z, in this equation. Let me know if you need any clarifications, thanks!
~ Padoru
