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- 7 + ( 17 + 6 ) = -7 + 23
= 16
( 12 + 7 ) + 42 = 19 + 42
= 61
32 + ( -14 + ( -8 )) = 32 + ( -14 + ( -8 )
= 32 + ( -14 - 8 )
= 32 + ( -22 )
= 32 - 22
= 10
( 2 × 8 ) ×9 = 16 × 9
= 144
( -6 × 7 ) x15 = ( -42 ) × 15
= -630
