d+12d+20=7

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Solution for d+12d+20=7 equation:


Simplifying
d + 12d + 20 = 7

Reorder the terms:
20 + d + 12d = 7

Combine like terms: d + 12d = 13d
20 + 13d = 7

Solving
20 + 13d = 7

Solving for variable 'd'.

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

Add '-20' to each side of the equation.
20 + -20 + 13d = 7 + -20

Combine like terms: 20 + -20 = 0
0 + 13d = 7 + -20
13d = 7 + -20

Combine like terms: 7 + -20 = -13
13d = -13

Divide each side by '13'.
d = -1

Simplifying
d = -1

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