\(\left(0,75-\dfrac{3}{2}\right)^3\\ =0,75^3-\left(3\times0,75^2\times\dfrac{3}{2}\right)+\left(3\times0,75\times\left(\dfrac{3}{2}\right)^2\right)-\left(\dfrac{3}{2}\right)^3\\ =\dfrac{27}{64}-\left(3\times\dfrac{9}{16}\times\dfrac{3}{2}\right)+\left(3\times0,75\times\dfrac{9}{4}\right)-\dfrac{27}{8}\\ =\dfrac{27}{64}-\dfrac{81}{32}+\dfrac{81}{16}-\dfrac{27}{8}\\ =\dfrac{81}{192}-\dfrac{486}{192}+\dfrac{972}{192}-\dfrac{648}{192}\\ =\dfrac{-81}{192}\\ =\dfrac{-27}{64}\)

\(2x\times9,5=10,5\\ 2x=10,5\div9,5\\ 2x=\dfrac{10,5}{9,5}\\ 2x=\dfrac{21}{19}\\ x=\dfrac{21}{19}\div2\\ x=\dfrac{21}{38}\)