420+60d=80d

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Solution for 420+60d=80d equation:


Simplifying
420 + 60d = 80d

Solving
420 + 60d = 80d

Solving for variable 'd'.

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

Add '-80d' to each side of the equation.
420 + 60d + -80d = 80d + -80d

Combine like terms: 60d + -80d = -20d
420 + -20d = 80d + -80d

Combine like terms: 80d + -80d = 0
420 + -20d = 0

Add '-420' to each side of the equation.
420 + -420 + -20d = 0 + -420

Combine like terms: 420 + -420 = 0
0 + -20d = 0 + -420
-20d = 0 + -420

Combine like terms: 0 + -420 = -420
-20d = -420

Divide each side by '-20'.
d = 21

Simplifying
d = 21

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