Answer:
z = 49
Step-by-step explanation:
z - 42 = 7
z - 42 = 7
+42 +42
z = 49
1. add 42 to both sides (adding because its - 42)
2. that leaves us with 7+42 = 49 so z=49
to check your answer u can always plug in 49.
49 - 42 = 7
yup. 49-42 does equal 7.
