-8d-9=-7d

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Solution for -8d-9=-7d equation:


Simplifying
-8d + -9 = -7d

Reorder the terms:
-9 + -8d = -7d

Solving
-9 + -8d = -7d

Solving for variable 'd'.

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

Add '7d' to each side of the equation.
-9 + -8d + 7d = -7d + 7d

Combine like terms: -8d + 7d = -1d
-9 + -1d = -7d + 7d

Combine like terms: -7d + 7d = 0
-9 + -1d = 0

Add '9' to each side of the equation.
-9 + 9 + -1d = 0 + 9

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

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

Divide each side by '-1'.
d = -9

Simplifying
d = -9

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