SOLUTION:

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Question 11445:
Answer by Kitty(1) About Me  (Show Source):
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5z(x-y)
replace z with 6, x with 5 and y with 2
so, 5.6(5-2)
= 30 (6 by 5 = 30) by 5 and -2
answer: 150 - 60= 90