(.10)(30-X)+.40X=(.30)(30)

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Solution for (.10)(30-X)+.40X=(.30)(30) equation:


Simplifying
(0.10)(30 + -1X) + 0.40X = (0.30)(30)
(30 * 0.10 + -1X * 0.10) + 0.40X = (0.30)(30)
(3 + -0.1X) + 0.40X = (0.30)(30)

Combine like terms: -0.1X + 0.40X = 0.3X
3 + 0.3X = (0.30)(30)

Multiply 0.30 * 30
3 + 0.3X = 9

Solving
3 + 0.3X = 9

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + -3 + 0.3X = 9 + -3

Combine like terms: 3 + -3 = 0
0 + 0.3X = 9 + -3
0.3X = 9 + -3

Combine like terms: 9 + -3 = 6
0.3X = 6

Divide each side by '0.3'.
X = 20

Simplifying
X = 20

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