(7-3xy)^3
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Step-by-step explanation:
(a - b)3 = a3 - 3a2b + 3ab2 - b3
a= 7
b = 3xy
(7-3xy)^3
= 7³ -3*7²* 3xy + 3*7* (3xy)² - (3xy) ³
= 343 - 441xy + 189 xy² - 27xy³
= 27xy³ - 189xy² + 441xy -343
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