\[x - 3(5x - 4) = - 10x + 1\]
\[x - 15x + 12 = - 10x + 1\]
\[- 14x + 10x = 1 - 12\]
\[- 4x = - 11\]
\[x = \frac{11}{4} = 2\frac{3}{4} = 2,75.\]