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18-x-3-2x=4+x-5
To find the opposite of x+3, find the opposite of each term.
15-x-2x=4+x-5
Subtract 3 from 18 to get 15.
15-3x=4+x-5
Combine -x and -2x to get -3x.
15-3x=-1+x
Subtract 5 from 4 to get -1.
15-3x-x=-1
Subtract x from both sides.
15-4x=-1
Combine -3x and -x to get -4x.
-4x=-1-15
Subtract 15 from both sides.
-4x=-16
Subtract 15 from -1 to get -16.
x=\frac{-16}{-4}
Divide both sides by -4.
x=4
Divide -16 by -4 to get 4.