\[18 - 0,2(3x - 70) = x\]
\[18 - 0,6x - 14 = x\]
\[- 1,6x = - 4\]
\[x = \frac{4}{1,6} = \frac{40}{16}\]
\[x = \frac{10}{4} = 2,5.\]