= 8 = + 4 = 8 + 4 = 12 2( + ) = 7 + + 4 = 6 + = (7 × 8) + (12) + 4 = (6 × 8) + (8) = 56 + 12 + 4 = 48 + 8 = 72 = 56 = 2 × ( + ) = 2 × 72 = 144 = 2( + ) = 2 × 56 = 112