d^2-9=d^2-7d+12

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Solution for d^2-9=d^2-7d+12 equation:


Simplifying
d2 + -9 = d2 + -7d + 12

Reorder the terms:
-9 + d2 = d2 + -7d + 12

Reorder the terms:
-9 + d2 = 12 + -7d + d2

Add '-1d2' to each side of the equation.
-9 + d2 + -1d2 = 12 + -7d + d2 + -1d2

Combine like terms: d2 + -1d2 = 0
-9 + 0 = 12 + -7d + d2 + -1d2
-9 = 12 + -7d + d2 + -1d2

Combine like terms: d2 + -1d2 = 0
-9 = 12 + -7d + 0
-9 = 12 + -7d

Solving
-9 = 12 + -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 + 7d = 12 + -7d + 7d

Combine like terms: -7d + 7d = 0
-9 + 7d = 12 + 0
-9 + 7d = 12

Add '9' to each side of the equation.
-9 + 9 + 7d = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 7d = 12 + 9
7d = 12 + 9

Combine like terms: 12 + 9 = 21
7d = 21

Divide each side by '7'.
d = 3

Simplifying
d = 3

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