What is 1+2? have detailed answer?

1+2 is 3 because if you add one fish to two fish its three fish. im great at explaining

Since we have a negative on the outside of the parenthesis, we can just say that this is -1. So now we have -1(-x + 1). when multiply a negative by a negative it cancels out into a positive. and multiplying a negative with a positive will give you a negative. So now we have x - 1.