40+d=2d+30

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Solution for 40+d=2d+30 equation:


Simplifying
40 + d = 2d + 30

Reorder the terms:
40 + d = 30 + 2d

Solving
40 + d = 30 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
40 + d + -2d = 30 + 2d + -2d

Combine like terms: d + -2d = -1d
40 + -1d = 30 + 2d + -2d

Combine like terms: 2d + -2d = 0
40 + -1d = 30 + 0
40 + -1d = 30

Add '-40' to each side of the equation.
40 + -40 + -1d = 30 + -40

Combine like terms: 40 + -40 = 0
0 + -1d = 30 + -40
-1d = 30 + -40

Combine like terms: 30 + -40 = -10
-1d = -10

Divide each side by '-1'.
d = 10

Simplifying
d = 10

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