You can put this solution on YOUR website! lets call the number x
we are told that the sum of a number and -7 is -12
write an equation
x + (-7) = -12
x - 7 = -12
solve for x by adding 7 to both sides
x - 7 + 7 = -12 + 7
The sevens on the left side cancel out
x = -12 + 7
x = -5 Answer: The number is -5
Check by replacing x in the original equation with -5
x + (-7) = -12
-5 + (-7) = -12
-12 = -12
