-((6-a)-(2a-3))
Apply the distributive property.
-(6-a-(2a)–3)
Multiply 2 by -1.
-(6-a-2a–3)
Multiply -1 by -3.
-(6-a-2a+3)
-(6-a-2a+3)
Add 6 and 3.
-(-a-2a+9)
Subtract 2a from -a.
-(-3a+9)
Apply the distributive property.
-(-3a)-1⋅9
Multiply.
Multiply -3 by -1.
3a-1⋅9
Multiply -1 by 9.
3a-9
3a-9
3a-9
Simplify -((6-a)-(2a-3))