a) 35 = 5x,
x = 7.
b) 50 = 2x*5x,
10x^2 = 50,
x^2 = 5,
x1 = 2.24, x2 = -2.24.
c) 30 = 2x*x,
x^2 = 15,
x1 = 3.87, x2 = -3.87.
d) 54 = 2x^3,
x^3 = 27,
x = 3.
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