Calcule a raíz das equações:

a)
 {6x}^{2} - 54 = 0
b)
 \frac{4}{5} {x}^{2} = 0
c)
 {x}^{2} + 3x = 0
d)
5 {p}^{2} - 20 = 0
e)
 \frac{ {q}^{2} }{4} + 5 = 21
f)
 { - k}^{2} + 6k = 0
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