Which equation has both 7 and -7 as a
possible value of x?

Where are the equations?? Provide them so we can choose which one of them has both 7 and -7 as a possible value of x

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^