40=10d-20

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Solution for 40=10d-20 equation: 


Simplifying
40 = 10d + -20

Reorder the terms:
40 = -20 + 10d

Solving
40 = -20 + 10d

Solving for variable 'd'.

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

Add '-10d' to each side of the equation.
40 + -10d = -20 + 10d + -10d

Combine like terms: 10d + -10d = 0
40 + -10d = -20 + 0
40 + -10d = -20

Add '-40' to each side of the equation.
40 + -40 + -10d = -20 + -40

Combine like terms: 40 + -40 = 0
0 + -10d = -20 + -40
-10d = -20 + -40

Combine like terms: -20 + -40 = -60
-10d = -60

Divide each side by '-10'.
d = 6

Simplifying
d = 6

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