The sum of -1 and -1 is -2.
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5
4 or 5-1
First point to make is a minus minus = a plus so your sum becomes an eighth plus a sixth. Next you need to apply a common denominator. In the case of eight and six this would be 24 so the sum is now 3 24ths plus 4 24ths = 7/24 or 0.29166667 as a decimal
It is -1.155 kilograms.
It is: 2d+9