Solve for x
x=12
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18=9-3-\left(-x\right)
To find the opposite of 3-x, find the opposite of each term.
18=9-3+x
The opposite of -x is x.
18=6+x
Subtract 3 from 9 to get 6.
6+x=18
Swap sides so that all variable terms are on the left hand side.
x=18-6
Subtract 6 from both sides.
x=12
Subtract 6 from 18 to get 12.
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