(Algebra Help)
In this equation I am to simplify (8z - 10) ÷ (-2) + 5(z - 1).
After struggling to solve it myself and reaping wrong results, I used an online math solver to help me, but even the first step is confusing! If you are knowledgeable please help me

Question

(Algebra Help)
In this equation I am to simplify  (8z - 10) ÷ (-2) + 5(z - 1). 
After struggling to solve it myself and reaping wrong results, I used an online math solver to help me, but even the first step is confusing! If you are knowledgeable please help me

anonymous · Answer

why would I multiply by 1/2?

anonymous · Answer

are you asking for the last step?
$$\int x^ndx={x^{n+1}\over n+1}+C$$

anonymous · Answer

the exponent of "z" is n = 1
so, its integration gives you z^2 and a division by "2"

precal · Answer

|dw:1366055019275:dw|is this your original problem?

anonymous · Answer

(8z - 10) ÷ (-2) + 5(z - 1) is my original problem. idk why the program solved for that, it's -2 not 1/2 i thought maybe it was using a formula or something

precal · Answer

|dw:1366055118098:dw|