1-2 [-3 + (8-2 x 5)]
Inner brackets first: 8-2x5. Here do multiplication first: 8 - 10 = -2
The original expression now becomes 1-2(-3+ -2)
Do the remaining bracket first; -3 + -2 = -5
So we now have 1 - 2(-5) = 1 +10 = 11