( -43 ) . ( 87 - 35 ) - 87 . ( 35 - 43 )
= ( -43 ) . 87 - ( -43 ) . 35 - 87 . 35 - 87 . 43
= ( -43 ). 87 - ( -43 ) . 35 - 87 . 35 - ( -87 ) . ( -43 )
= ( -43 ) . { [ 87 - ( -43 ) - ( -43 ) ] } - 87 . 35
= ( -43 ). { [ 87 + 43 + 43 ] - 87 . 35
= ( -43 ) . 173 - 87 . 35
= ( -7439 ) - 3045
= -10484