20) 1,5-4r+0,5-(-r) +(2,5-16r) + 26r

1. Remove parentheses: 1.5 - 4r + 0.5 + r + 2.5 - 16r + 26r.

2. Combine like terms: (1.5 + 0.5 + 2.5) + (-4r + r - 16r + 26r).

3. Simplify: 4.5 + 7r.