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d=\frac{5}{2}-\frac{1}{2}x
Divide each term of 5-x by 2 to get \frac{5}{2}-\frac{1}{2}x.
\frac{5}{2}-\frac{1}{2}x=d
Swap sides so that all variable terms are on the left hand side.
-\frac{1}{2}x=d-\frac{5}{2}
Subtract \frac{5}{2} from both sides.
\frac{-\frac{1}{2}x}{-\frac{1}{2}}=\frac{d-\frac{5}{2}}{-\frac{1}{2}}
Multiply both sides by -2.
x=\frac{d-\frac{5}{2}}{-\frac{1}{2}}
Dividing by -\frac{1}{2} undoes the multiplication by -\frac{1}{2}.
x=5-2d
Divide d-\frac{5}{2} by -\frac{1}{2} by multiplying d-\frac{5}{2} by the reciprocal of -\frac{1}{2}.
d=\frac{5}{2}-\frac{1}{2}x
Divide each term of 5-x by 2 to get \frac{5}{2}-\frac{1}{2}x.