7d-3-8d+15-d=-d-12+7d

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Solution for 7d-3-8d+15-d=-d-12+7d equation: 


Simplifying
7d + -3 + -8d + 15 + -1d = -1d + -12 + 7d

Reorder the terms:
-3 + 15 + 7d + -8d + -1d = -1d + -12 + 7d

Combine like terms: -3 + 15 = 12
12 + 7d + -8d + -1d = -1d + -12 + 7d

Combine like terms: 7d + -8d = -1d
12 + -1d + -1d = -1d + -12 + 7d

Combine like terms: -1d + -1d = -2d
12 + -2d = -1d + -12 + 7d

Reorder the terms:
12 + -2d = -12 + -1d + 7d

Combine like terms: -1d + 7d = 6d
12 + -2d = -12 + 6d

Solving
12 + -2d = -12 + 6d

Solving for variable 'd'.

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

Add '-6d' to each side of the equation.
12 + -2d + -6d = -12 + 6d + -6d

Combine like terms: -2d + -6d = -8d
12 + -8d = -12 + 6d + -6d

Combine like terms: 6d + -6d = 0
12 + -8d = -12 + 0
12 + -8d = -12

Add '-12' to each side of the equation.
12 + -12 + -8d = -12 + -12

Combine like terms: 12 + -12 = 0
0 + -8d = -12 + -12
-8d = -12 + -12

Combine like terms: -12 + -12 = -24
-8d = -24

Divide each side by '-8'.
d = 3

Simplifying
d = 3

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