D+d+d+d+12=d+30

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Solution for D+d+d+d+12=d+30 equation:


Simplifying
D + d + d + d + 12 = d + 30

Reorder the terms:
12 + D + d + d + d = d + 30

Combine like terms: d + d = 2d
12 + D + 2d + d = d + 30

Combine like terms: 2d + d = 3d
12 + D + 3d = d + 30

Reorder the terms:
12 + D + 3d = 30 + d

Solving
12 + D + 3d = 30 + d

Solving for variable 'D'.

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

Add '-12' to each side of the equation.
12 + D + -12 + 3d = 30 + -12 + d

Reorder the terms:
12 + -12 + D + 3d = 30 + -12 + d

Combine like terms: 12 + -12 = 0
0 + D + 3d = 30 + -12 + d
D + 3d = 30 + -12 + d

Combine like terms: 30 + -12 = 18
D + 3d = 18 + d

Add '-3d' to each side of the equation.
D + 3d + -3d = 18 + d + -3d

Combine like terms: 3d + -3d = 0
D + 0 = 18 + d + -3d
D = 18 + d + -3d

Combine like terms: d + -3d = -2d
D = 18 + -2d

Simplifying
D = 18 + -2d

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