0.1d+0.05(21-d)=1.65

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Solution for 0.1d+0.05(21-d)=1.65 equation: 


Simplifying
0.1d + 0.05(21 + -1d) = 1.65
0.1d + (21 * 0.05 + -1d * 0.05) = 1.65
0.1d + (1.05 + -0.05d) = 1.65

Reorder the terms:
1.05 + 0.1d + -0.05d = 1.65

Combine like terms: 0.1d + -0.05d = 0.05d
1.05 + 0.05d = 1.65

Solving
1.05 + 0.05d = 1.65

Solving for variable 'd'.

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

Add '-1.05' to each side of the equation.
1.05 + -1.05 + 0.05d = 1.65 + -1.05

Combine like terms: 1.05 + -1.05 = 0.00
0.00 + 0.05d = 1.65 + -1.05
0.05d = 1.65 + -1.05

Combine like terms: 1.65 + -1.05 = 0.6
0.05d = 0.6

Divide each side by '0.05'.
d = 12

Simplifying
d = 12

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