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2014-12-14T11:48:14+08:00

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First, write this in linear equation:
Let x be the unknown number, it can be shown like this:

x+(-15)=+7
or
x-15=7
Transfer the 15 to the other side and change its sign: The -15 will become +15 after transferring to the other side.
x=7+15
Simplify it by doing the operations:
x=22
Check:
22+-15=7
22-15=7
7=7, Correct! 
Therefore the number that must be added to -15 to produce +7 is 22.
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2014-12-14T12:56:48+08:00

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let\ x\ be\ the\ unknown\ number. \\ \\ Solution; \\ -15+x=7 \\ \\ x=7+15(Transpose\ 15\ to\ the\ other\ side.) \\ \\ \boxed{\boxed{x=22}} \\ \\ Checking; \\ Let\ \boxed{x\to22} \\ \\ -15+x=7 \\ \\ -15+22=7 \\ \\ \boxed{\boxed{7=7}}\ \underline{TRUE} \\ \\ Hope\ it\ Helps:) \\ Domini
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