Use the rule for order of operations to simplify the expression as much as possible:

`-6+7(-3+6) =`

Use the rule for order of operations to simplify the expression as much as possible:

`9(-5+7) + 2(-4+7) =`

Use the rule for order of operations to simplify the expression as much as possible:

`-6+(-12)-:3+3(-5) =`