Answer
The solution is -8
Work Step by Step
7-z=15 Subtract 7 from both sides
7-z -7=15-7
-z=8 Divide both sides by -1
$\frac{-z}{-1}$=$\frac{8}{-1}$
z=-8
The solution is -8
Check
7-z=15
7-(-8)=15
7+8=15
15=15
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