Posted by **Lisa** on Friday, May 13, 2011 at 4:46pm.

Solve for x using the addition principle.

x+10=-8

The solution x=

- Algebra -
**Anonymous**, Saturday, May 14, 2011 at 2:02am
The addition principle says you can add the same number to both sides of an equation without changing the value of the variable. In this case, we choose to add -10, so that the sum of constants on the left side will be zero.

x+10= -8

x+10-10= -8-10

x= -18

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