3(12+2d)-7=13-(12+2d)

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Solution for 3(12+2d)-7=13-(12+2d) equation:


Simplifying
3(12 + 2d) + -7 = 13 + -1(12 + 2d)
(12 * 3 + 2d * 3) + -7 = 13 + -1(12 + 2d)
(36 + 6d) + -7 = 13 + -1(12 + 2d)

Reorder the terms:
36 + -7 + 6d = 13 + -1(12 + 2d)

Combine like terms: 36 + -7 = 29
29 + 6d = 13 + -1(12 + 2d)
29 + 6d = 13 + (12 * -1 + 2d * -1)
29 + 6d = 13 + (-12 + -2d)

Combine like terms: 13 + -12 = 1
29 + 6d = 1 + -2d

Solving
29 + 6d = 1 + -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.
29 + 6d + 2d = 1 + -2d + 2d

Combine like terms: 6d + 2d = 8d
29 + 8d = 1 + -2d + 2d

Combine like terms: -2d + 2d = 0
29 + 8d = 1 + 0
29 + 8d = 1

Add '-29' to each side of the equation.
29 + -29 + 8d = 1 + -29

Combine like terms: 29 + -29 = 0
0 + 8d = 1 + -29
8d = 1 + -29

Combine like terms: 1 + -29 = -28
8d = -28

Divide each side by '8'.
d = -3.5

Simplifying
d = -3.5

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