2.1d+5+0.9d=d-1

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Solution for 2.1d+5+0.9d=d-1 equation:


Simplifying
2.1d + 5 + 0.9d = d + -1

Reorder the terms:
5 + 2.1d + 0.9d = d + -1

Combine like terms: 2.1d + 0.9d = 3d
5 + 3d = d + -1

Reorder the terms:
5 + 3d = -1 + d

Solving
5 + 3d = -1 + 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.
5 + 3d + -1d = -1 + d + -1d

Combine like terms: 3d + -1d = 2d
5 + 2d = -1 + d + -1d

Combine like terms: d + -1d = 0
5 + 2d = -1 + 0
5 + 2d = -1

Add '-5' to each side of the equation.
5 + -5 + 2d = -1 + -5

Combine like terms: 5 + -5 = 0
0 + 2d = -1 + -5
2d = -1 + -5

Combine like terms: -1 + -5 = -6
2d = -6

Divide each side by '2'.
d = -3

Simplifying
d = -3

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