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y+2=-x+4
To find the opposite of x-4, find the opposite of each term.
-x+4=y+2
Swap sides so that all variable terms are on the left hand side.
-x=y+2-4
Subtract 4 from both sides.
-x=y-2
Subtract 4 from 2 to get -2.
\frac{-x}{-1}=\frac{y-2}{-1}
Divide both sides by -1.
x=\frac{y-2}{-1}
Dividing by -1 undoes the multiplication by -1.
x=2-y
Divide y-2 by -1.
y+2=-x+4
To find the opposite of x-4, find the opposite of each term.
y=-x+4-2
Subtract 2 from both sides.
y=-x+2
Subtract 2 from 4 to get 2.