60d-80d=420+1d-80d

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Solution for 60d-80d=420+1d-80d equation: 


Simplifying
60d + -80d = 420 + 1d + -80d

Combine like terms: 60d + -80d = -20d
-20d = 420 + 1d + -80d

Combine like terms: 1d + -80d = -79d
-20d = 420 + -79d

Solving
-20d = 420 + -79d

Solving for variable 'd'.

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

Add '79d' to each side of the equation.
-20d + 79d = 420 + -79d + 79d

Combine like terms: -20d + 79d = 59d
59d = 420 + -79d + 79d

Combine like terms: -79d + 79d = 0
59d = 420 + 0
59d = 420

Divide each side by '59'.
d = 7.118644068

Simplifying
d = 7.118644068

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