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

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

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

`3(-4+9) + 7(-3+4) =`

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

`7+28-:(-7)+3(-1) =`