Question

13 + (– 12)] + (............) = 13 + [(–12) + (–7)]​

Answer 1

$13 + (– 12) + \underline{ \: \: \: \: \: \: \: \: \: \: } = 13 + [(–12) + (–7)] \\ \\ 13 - 12 + \underline{ \: \: \: \: \: \: \: \: \: \: } = 13 + [ - 12 - 7] \\ 1 +\underline{ \: \: \: \: \: \: \: \: \: \: } = 13 + ( - 19) \\ 1 + \underline{ \: \: \: \: \: \: \: \: \: \: } = 13 - 19 \\1 + \underline{ \: \: \: \: \: \: \: \: \: \: } = - 6\\ \underline{ \: \: \: \: \: \: \: \: \: \: } = - 6 - 1 \\ \underline{ \: \: \: \: \: \: \: \: \: \: } = \red{- 7}$

Answer 2

Answer:

-7

Step-by-step explanation:

• 13 + (-12) + ___ =13 +[(-12) + (-7)]
• 13 +(-12)+____ = 13 + [(-19)]
• 1 +__ = -6
• ___ = -6-1
• ___ = -7