-9=d-7

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Solution for -9=d-7 equation:


Simplifying
-9 = d + -7

Reorder the terms:
-9 = -7 + d

Solving
-9 = -7 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
-9 + -1d = -7 + d + -1d

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

Add '9' to each side of the equation.
-9 + 9 + -1d = -7 + 9

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

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

Divide each side by '-1'.
d = -2

Simplifying
d = -2

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