3d+2.1=.2d

Solution for 3d+2.1=.2d equation:

Simplifying
3d + 2.1 = 0.2d

Reorder the terms:
2.1 + 3d = 0.2d

Solving
2.1 + 3d = 0.2d

Solving for variable 'd'.

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

Add '-0.2d' to each side of the equation.
2.1 + 3d + -0.2d = 0.2d + -0.2d

Combine like terms: 3d + -0.2d = 2.8d
2.1 + 2.8d = 0.2d + -0.2d

Combine like terms: 0.2d + -0.2d = 0.0
2.1 + 2.8d = 0.0

Add '-2.1' to each side of the equation.
2.1 + -2.1 + 2.8d = 0.0 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + 2.8d = 0.0 + -2.1
2.8d = 0.0 + -2.1

Combine like terms: 0.0 + -2.1 = -2.1
2.8d = -2.1

Divide each side by '2.8'.
d = -0.75

Simplifying
d = -0.75