\( \begin{array}{ll}\text { a) } & -(+4)+(-2)+(-7-5)-(-1)-(-2-3)= \\ \text { b) } & -(+5)-(+10)+(-3)-(-4)+(+5)-(+2)= \\ \text { c) } & 5-[7-2-(1-9)-3+(4-7)-12]+4= \\ \text { d) } & 8-[6-(-3+7-1+4)-6]+4+5= \\ \text { e) } & 1+(-6+3+1)-[-2-(5-3+1)-2]= \\ \text { f) } & 7-\{4+2-20+[-5+3-(-15)+3]-1\}= \\ \text { g) } & -2-3+1-[7+6+(4-5)-2]+1-3=\end{array} \)
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Let's work through each expression step by step: a) \[ -(+4) + (-2) + (-7 - 5) - (-1) - (-2 - 3) = -4 - 2 - 12 + 1 + 5 = -4 - 2 - 12 + 6 = -12 \] b) \[ -(+5) - (+10) + (-3) - (-4) + (+5) - (+2) = -5 - 10 - 3 + 4 + 5 - 2 = -5 - 10 - 3 + 4 + 5 - 2 = -11 \] c) \[ 5 - [7 - 2 - (1 - 9) - 3 + (4 - 7) - 12] + 4 = 5 - [7 - 2 + 8 - 3 - 3 - 12] + 4 = 5 - [7 - 2 + 8 - 3 - 3 - 12] + 4 = 5 - [7 - 2 + 8 - 3 - 15] + 4 = 5 - [-5] + 4 = 5 + 5 + 4 = 14 \] d) \[ 8 - [6 - (-3 + 7 - 1 + 4) - 6] + 4 + 5 = 8 - [6 - (3) - 6] + 4 + 5 = 8 - [6 - 3 - 6] + 4 + 5 = 8 - [-3] + 4 + 5 = 8 + 3 + 4 + 5 = 20 \] e) \[ 1 + (-6 + 3 + 1) - [-2 - (5 - 3 + 1) - 2] = 1 - 2 - [-2 - (5 - 3 + 1) - 2] = 1 - 2 - [-2 - 3 - 2] = 1 - 2 - (-7) = 1 - 2 + 7 = 6 \] f) \[ 7 - \{4 + 2 - 20 + [-5 + 3 - (-15) + 3] - 1\} = 7 - \{4 + 2 - 20 + [13] - 1\} = 7 - \{4 + 2 - 20 + 13 - 1\} = 7 - \{-2\} = 7 + 2 = 9 \] g) \[ -2 - 3 + 1 - [7 + 6 + (4 - 5) - 2] + 1 - 3 = -2 - 3 + 1 - [7 + 6 - 1 - 2] + 1 - 3 = -2 - 3 + 1 - [10] + 1 - 3 = -2 - 3 + 1 - 10 + 1 - 3 = -16 \] Here are the final answers for each expression: a) -12 b) -11 c) 14 d) 20 e) 6 f) 9 g) -16