9d-7d-d-1=12

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Solution for 9d-7d-d-1=12 equation:


Simplifying
9d + -7d + -1d + -1 = 12

Reorder the terms:
-1 + 9d + -7d + -1d = 12

Combine like terms: 9d + -7d = 2d
-1 + 2d + -1d = 12

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

Solving
-1 + 1d = 12

Solving for variable 'd'.

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

Add '1' to each side of the equation.
-1 + 1 + 1d = 12 + 1

Combine like terms: -1 + 1 = 0
0 + 1d = 12 + 1
1d = 12 + 1

Combine like terms: 12 + 1 = 13
1d = 13

Divide each side by '1'.
d = 13

Simplifying
d = 13

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