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Ian Powell
Mathematics
8 September, 18:25
Solve for z. 8z - 4 = 7z
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Sanaa Rosario
8 September, 18:50
0
8z - 4 = 7z
move 8z to the other side
sign changes from + 8z to - 8z
8z-8z-4=7z-8z
-4 = 7z-8z
-4 = - z
mutiply both sides by - 1 to get + z
(-4) (-1) = (-z) (-1)
Answer:
z = 4
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