d-x=21

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Solution for d-x=21 equation: 


Simplifying
d + -1x = 21

Solving
d + -1x = 21

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add 'x' to each side of the equation.
d + -1x + x = 21 + x

Combine like terms: -1x + x = 0
d + 0 = 21 + x
d = 21 + x

Simplifying
d = 21 + x

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