Algebra
posted by Lisa .
Solve for x using the addition principle.
x+10=8
The solution x=

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+1010= 810
x= 18
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