The sum of 9 and a number is 6. What is the number?

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Answer 1 · 2017-03-08T09:10:57

#-3#

Let #x# be the number to find.

The sum of #9# and the number #=>x+9#

The sum is #6#

#=>x+9=6#

solve

#x+cancel(9-9)=6-9#

#x=-3#