D=-0.3n+35-(0.2n+10)

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Solution for D=-0.3n+35-(0.2n+10) equation: 


Simplifying
D = -0.3n + 35 + -1(0.2n + 10)

Reorder the terms:
D = -0.3n + 35 + -1(10 + 0.2n)
D = -0.3n + 35 + (10 * -1 + 0.2n * -1)
D = -0.3n + 35 + (-10 + -0.2n)

Reorder the terms:
D = 35 + -10 + -0.3n + -0.2n

Combine like terms: 35 + -10 = 25
D = 25 + -0.3n + -0.2n

Combine like terms: -0.3n + -0.2n = -0.5n
D = 25 + -0.5n

Solving
D = 25 + -0.5n

Solving for variable 'D'.

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

Simplifying
D = 25 + -0.5n

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