7z + 10 - z = 8z - 2(z - 5)
7z + 10 - z = 8z - 2z + 10
6z + 10 = 6z + 10
6z - 6z = 10 - 10
0 = 0
Therefore, 7z + 10 - z = 8z - 2(z - 5)
0.77875...
which, I'm assuming, they want you to round to the nearest hundredth? So, .78?...
The answer is 217 with a remainder of 20.
explanation is in the picture.
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