(-987) - (+103) = -1090
EXPLANATION
Multipying negative(-) to positive(+) will always be negative(-) , multiplying (+) to (+) = (+) and multiplying (-) to (-) = (+).
solution
(-987) - (+103) =
first multiply minus sign (-) to (+103)
-987 -103 =
then add the number and copy the negative(-) sign before the number
answer
-1090
