Question

what must be subtracted from -7 to obtain -15

Answer 1

Hey mate !!

Let d required number be x

-7 - x = -15
-x = -15+7
-x = -8
x = 8

Hope this helps☺☺

Answer 2

$let \: the \: required \: number \: be \: x... \\ so \: .... \: according \: to \: question... \\ - 7 - x \: = \: ( - 15 \: ) \\ x \: = \: - 7 + 15 \\ x = 8$
Hope it helps....☺️☺️