12=-2d+3.2

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Solution for 12=-2d+3.2 equation:


Simplifying
12 = -2d + 3.2

Reorder the terms:
12 = 3.2 + -2d

Solving
12 = 3.2 + -2d

Solving for variable 'd'.

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

Add '2d' to each side of the equation.
12 + 2d = 3.2 + -2d + 2d

Combine like terms: -2d + 2d = 0
12 + 2d = 3.2 + 0
12 + 2d = 3.2

Add '-12' to each side of the equation.
12 + -12 + 2d = 3.2 + -12

Combine like terms: 12 + -12 = 0
0 + 2d = 3.2 + -12
2d = 3.2 + -12

Combine like terms: 3.2 + -12 = -8.8
2d = -8.8

Divide each side by '2'.
d = -4.4

Simplifying
d = -4.4

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