78=3d+12-d+4

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Solution for 78=3d+12-d+4 equation:


Simplifying
78 = 3d + 12 + -1d + 4

Reorder the terms:
78 = 12 + 4 + 3d + -1d

Combine like terms: 12 + 4 = 16
78 = 16 + 3d + -1d

Combine like terms: 3d + -1d = 2d
78 = 16 + 2d

Solving
78 = 16 + 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.
78 + -2d = 16 + 2d + -2d

Combine like terms: 2d + -2d = 0
78 + -2d = 16 + 0
78 + -2d = 16

Add '-78' to each side of the equation.
78 + -78 + -2d = 16 + -78

Combine like terms: 78 + -78 = 0
0 + -2d = 16 + -78
-2d = 16 + -78

Combine like terms: 16 + -78 = -62
-2d = -62

Divide each side by '-2'.
d = 31

Simplifying
d = 31

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