21d+18=2.1(d+8)

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Solution for 21d+18=2.1(d+8) equation:


Simplifying
21d + 18 = 2.1(d + 8)

Reorder the terms:
18 + 21d = 2.1(d + 8)

Reorder the terms:
18 + 21d = 2.1(8 + d)
18 + 21d = (8 * 2.1 + d * 2.1)
18 + 21d = (16.8 + 2.1d)

Solving
18 + 21d = 16.8 + 2.1d

Solving for variable 'd'.

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

Add '-2.1d' to each side of the equation.
18 + 21d + -2.1d = 16.8 + 2.1d + -2.1d

Combine like terms: 21d + -2.1d = 18.9d
18 + 18.9d = 16.8 + 2.1d + -2.1d

Combine like terms: 2.1d + -2.1d = 0.0
18 + 18.9d = 16.8 + 0.0
18 + 18.9d = 16.8

Add '-18' to each side of the equation.
18 + -18 + 18.9d = 16.8 + -18

Combine like terms: 18 + -18 = 0
0 + 18.9d = 16.8 + -18
18.9d = 16.8 + -18

Combine like terms: 16.8 + -18 = -1.2
18.9d = -1.2

Divide each side by '18.9'.
d = -0.06349206349

Simplifying
d = -0.06349206349

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