Question 117911

The sum of a number {{{x}}} and {{{-7}}} is  {{{-12}}} we can write like this:

{{{x+(-7) = -12}}}

{{{x - 7 = - 12}}}.....add {{{7}}} to the both sides

{{{x - 7 + 7 = - 12 + 7}}}

{{{x = - 5}}}

check:

{{{x+(-7) = -12}}}....substitute {{{x}}}

{{{(-5)+(-7) = -12}}}

{{{-(5+7) = -12}}}

{{{-12 = -12}}}