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

`3+5(-6+7) =`

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

`3(-5+7) + 5(-2+6) =`

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

`7+(-16)-:4+2(4) =`