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-x-\left(-10\right)=3x+2
To find the opposite of x-10, find the opposite of each term.
-x+10=3x+2
The opposite of -10 is 10.
-x+10-3x=2
Subtract 3x from both sides.
-4x+10=2
Combine -x and -3x to get -4x.
-4x=2-10
Subtract 10 from both sides.
-4x=-8
Subtract 10 from 2 to get -8.
x=\frac{-8}{-4}
Divide both sides by -4.
x=2
Divide -8 by -4 to get 2.