Odpowiedź :
[tex]U = \frac{r - a}{g} - c | \times g \\ Ug = r - a - cg | + a + cg \\ \boxed{Ug + a + cg = r}[/tex]
[tex]U = \frac{r - a}{g} - c | \times g \\Ug = r - a - cg | - r + cg \\ Ug - r + cg = - a \\ \boxed{a = - Ug + r - cg}[/tex]
[tex]U = \frac{r - a}{g} - c | \times g \\ Ug = r - a - cg | - r + a \\ Ug - r + a = - cg | \div ( - c) \\ \boxed{g = - \frac{Ug - r + a}{c} }[/tex]
[tex]U = \frac{r - a}{g} - c | \times g \\ Ug = r - a - cg | - r + a \\ Ug - r + a = - cg | \div g \\ \frac{Ug - r + a}{g} = - c \\ \boxed{ c = - \frac{Ug + r - a}{g} }[/tex]