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I suppose you add the two problems up because of the word sum
`(1-4) + (1-7)`
`-3 + (-5)`
So the sum between 1-4 and 1-7 would be -8.
To get the sum, put parenthesis around 1-4 and around 1-7 to indicate separate groups. Then, add the two groups.
Then, simplify by doing the operation inside each group.
`=-3 + (-6)`
Since the simplified form of the two groups have the same sign, to compute, add the numbers and copy the sign.
Hence, the sum of 1-4 and 1-7 is -9.
how do you calculate the sum of 1 - 4 and 1 - 7
(1 - 4) + (1 - 7)
First solve within the brackets
(-3) + (-6)
Then open the brackets (when the brackets are opened -3 will be written as it is and -6 will also remain the same because when 2 different signs are multiplied the sign becomes minus)
-3 - 6
Both are then added because they both have the same sign, and sign of the bigger number is taken.
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