11d-9d-1=7

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Solution for 11d-9d-1=7 equation: 


Simplifying
11d + -9d + -1 = 7

Reorder the terms:
-1 + 11d + -9d = 7

Combine like terms: 11d + -9d = 2d
-1 + 2d = 7

Solving
-1 + 2d = 7

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 + 2d = 7 + 1

Combine like terms: -1 + 1 = 0
0 + 2d = 7 + 1
2d = 7 + 1

Combine like terms: 7 + 1 = 8
2d = 8

Divide each side by '2'.
d = 4

Simplifying
d = 4

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