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

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


Simplifying
3(13 + 2d) + -7 = 13 + -1(12 + 2d)
(13 * 3 + 2d * 3) + -7 = 13 + -1(12 + 2d)
(39 + 6d) + -7 = 13 + -1(12 + 2d)

Reorder the terms:
39 + -7 + 6d = 13 + -1(12 + 2d)

Combine like terms: 39 + -7 = 32
32 + 6d = 13 + -1(12 + 2d)
32 + 6d = 13 + (12 * -1 + 2d * -1)
32 + 6d = 13 + (-12 + -2d)

Combine like terms: 13 + -12 = 1
32 + 6d = 1 + -2d

Solving
32 + 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.
32 + 6d + 2d = 1 + -2d + 2d

Combine like terms: 6d + 2d = 8d
32 + 8d = 1 + -2d + 2d

Combine like terms: -2d + 2d = 0
32 + 8d = 1 + 0
32 + 8d = 1

Add '-32' to each side of the equation.
32 + -32 + 8d = 1 + -32

Combine like terms: 32 + -32 = 0
0 + 8d = 1 + -32
8d = 1 + -32

Combine like terms: 1 + -32 = -31
8d = -31

Divide each side by '8'.
d = -3.875

Simplifying
d = -3.875

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