Verified Answer :

pandahelper

So, to solve for H,
you need to undo the problem.
so since 17 is being subtracted,
you do the opposite if subtract
and add 17 to -12
so, 17+ (-12)= 5
To conclude H= 5
to check your answer add the 5 to replace the H
5-17=-12

AL2006

The quickest, simplest, easiest way is to add 17. to each side of the equation.

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