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15-x-\left(-5\right)=0
To find the opposite of x-5, find the opposite of each term.
15-x+5=0
The opposite of -5 is 5.
20-x=0
Add 15 and 5 to get 20.
-x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=20
Multiply both sides by -1.