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x (x²y²) = 72
x (xy)² = 72
x . 6² = 72
x . 36 = 72
x = 2
1/2 x - 6 = ??
= 1/2. 2 - 6
= 1-6
= -5
xy (x²y)=72
6 x²y =72
x²y = 12
xy (x)=12
6x = 12
x = 2
1/2 x 2 -6 =-5