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Subjects>Math>Math & Arithmetic

15 equals -x plus 8 what is the value of x?

Updated: 12/21/2022

Wiki User

∙ 15y ago

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Melvina Boyle ∙

Lvl 10

∙ 3y ago

This answer is:

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Wiki User

∙ 15y ago

If 15=-x+8,
then we use the additive property of equality to see that
-x=15-8.
So after subtracting we have
-x=7 or x=-7.

It is always important to check your answer.

15=-(-7)+8
or 15=7+8 which is true.

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