Ialso need with this, what is 300=4z-111+3z-12? (can you explain how you got it so i can understand? ) i will be giving 58 points to the person who answers correctly.

Well put it in correct order : 4z-111+3z-12=300.

4z−111+3z−12=300
4z−111+3z−12=300
7z−123=300
7z−123+123=300+123
7z=423
7z7=423/7
z=423/7
Your answer is z=423/7.

Hoped I helped!

To solve 300=4z-111+3z-12, we first have to combine like terms. As so:

300 = 4z -111 + 3z - 12
300 = 7z - 111 - 12
300 = 7z - 123

Next, we can simplify this even further to get z by itself on one side of the equation:

Let's add 123 to each side:

300 = 7z - 123
300 + 123 = 7z - 123 + 123
423 = 7z

Now, all we have to do is divide 7 to each side, resulting with only z on the right side of the equation:

423 / 7 = 7z / 7
423 / 7 = z
60.42857143 = z (Jeez... long decimal.)

Hope I could help! Have a good one!
If I am wrong, please let me know!

Do the inverse operation