If a + B = - 1, what is the value of the algebraic formula 3A (a + b) - 5a-5b + 7

If a + B = - 1, what is the value of the algebraic formula 3A (a + b) - 5a-5b + 7

3a(a+b)-5a-5b+7=3a(a+b)-5(a+b)+7=3a(-1)+5+7=-3a+12