10d-1=9d

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Solution for 10d-1=9d equation:


Simplifying
10d + -1 = 9d

Reorder the terms:
-1 + 10d = 9d

Solving
-1 + 10d = 9d

Solving for variable 'd'.

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

Add '-9d' to each side of the equation.
-1 + 10d + -9d = 9d + -9d

Combine like terms: 10d + -9d = 1d
-1 + 1d = 9d + -9d

Combine like terms: 9d + -9d = 0
-1 + 1d = 0

Add '1' to each side of the equation.
-1 + 1 + 1d = 0 + 1

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

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

Divide each side by '1'.
d = 1

Simplifying
d = 1

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