Triangle DEF and triangle DGF are shown in the diagram.
2 answers:
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First simplify the number part, 14/2 = 7/1
then the x part,
y doesn't need to be simplified
then simplify the z part, z^-6 = z^6
put it all together...
then the x part,
y doesn't need to be simplified
then simplify the z part, z^-6 = z^6
put it all together...