a) (7x - 11)3 = 25.52 + 200
(7x - 11)3 = 32.25 + 200
(7x - 11)3 = 800 + 200
(7x - 11)3 = 1000 = 103
=> 7x - 11 = 10
=> 7x = 10 + 11 = 21
=> x = 21 : 7 = 3
b) \(1\frac{1}{3}x+16\frac{3}{4}=-13,25\)
=> \(\frac{4}{3}x+\frac{67}{4}=-\frac{53}{4}\)
=> \(\frac{4}{3}x=-\frac{53}{4}-\frac{67}{4}\)
=> \(\frac{4}{3}x=-30\)
=> \(x=-30:\frac{4}{3}\)
=> \(x=-30.\frac{3}{4}=-\frac{45}{2}\)