Let's simplify the expression step by step:

-(3(2a-6) + 2(26-1))

Distribute the negative sign to both terms inside the parentheses:
-(-6a + 18 - 52 + 2)
6a - 18 + 52 - 2
6a + 342(1 - (a-46) + 3(a-6) + 2 - (a + (b - 2a)))Simplify the expression inside the parentheses first:
1 - a + 46 + 3a - 18 + 2 - a - b + 2a
Combine like terms:
3a - 2 - b + 28 + 2a
5a - b + 26

Add the results from step 1 and step 2:
6a + 34 + 5a - b + 26
Combine like terms:
11a + 60 - b

Therefore, the simplified expression is 11a + 60 - b.