what is the explainaton to (2x+6)^3=-27?

I would like the explaination of this problem above due to the fact that in order to get the answer you have to find the cube root of -27?
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1 Answer

(2x+6)^3=-27

(2x+6) =-3

2x=-3-6 =-9

x=-9/2

x=-4.5
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