The simplified expression is 0r, which is equivalent to just 0.
The Breakdown
To simplify the expression 10r - 5r + 3r - 8r, we can combine like terms by adding or subtracting the coefficients of the same variable.
10r - 5r + 3r - 8r simplifies to (10 - 5 + 3 - 8)r.
Now, let's perform the arithmetic:
10 - 5 + 3 - 8 = 0
Therefore, the simplified expression is 0r, which is equivalent to just 0.