(9,8-x):9=0,7

To solve the equation \((9, 8 - x) : 9 = 0.7\), we first recognize that the notation \((9, 8 - x)\) seems to suggest either a coordinate point or a tuple. However, it appears that we should focus on simplifying the expression.

Assuming the equation can be rewritten without the comma (as it seems there might be a typographical error), we have:

\[ \frac{9(8 - x)}{9} = 0.7 \]

Since dividing by 9 cancels out, we simplify to:

\[ 8 - x = 0.7 \]

Now, we solve for \(x\):

\[ -x = 0.7 - 8 \] \[ -x = 0.7 - 8 = -7.3 \] \[ x = 7.3 \]

Thus, the solution to the equation is:

\[ \boxed{7.3} \]