6.9=d+3.9

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Solution for 6.9=d+3.9 equation:


Simplifying
6.9 = d + 3.9

Reorder the terms:
6.9 = 3.9 + d

Solving
6.9 = 3.9 + 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.
6.9 + -1d = 3.9 + d + -1d

Combine like terms: d + -1d = 0
6.9 + -1d = 3.9 + 0
6.9 + -1d = 3.9

Add '-6.9' to each side of the equation.
6.9 + -6.9 + -1d = 3.9 + -6.9

Combine like terms: 6.9 + -6.9 = 0.0
0.0 + -1d = 3.9 + -6.9
-1d = 3.9 + -6.9

Combine like terms: 3.9 + -6.9 = -3
-1d = -3

Divide each side by '-1'.
d = 3

Simplifying
d = 3

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