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Indices Calculated

From a textbook-
Solve the following equations for x:

1. 7x^1/2 + 2 = 0. Answer given 4/49

2. 6x^3/2 - 2/3x^-1/2 = 0. Answer given 1/3

3. 5x^3/4 + 40 = 0. Answer given 16

Any help appreciated - I'm struggling wit this particular type of equation

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