21=0.3(3-4x)

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Solution for 21=0.3(3-4x) equation:


Simplifying
21 = 0.3(3 + -4x)
21 = (3 * 0.3 + -4x * 0.3)
21 = (0.9 + -1.2x)

Solving
21 = 0.9 + -1.2x

Solving for variable 'x'.

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

Add '1.2x' to each side of the equation.
21 + 1.2x = 0.9 + -1.2x + 1.2x

Combine like terms: -1.2x + 1.2x = 0.0
21 + 1.2x = 0.9 + 0.0
21 + 1.2x = 0.9

Add '-21' to each side of the equation.
21 + -21 + 1.2x = 0.9 + -21

Combine like terms: 21 + -21 = 0
0 + 1.2x = 0.9 + -21
1.2x = 0.9 + -21

Combine like terms: 0.9 + -21 = -20.1
1.2x = -20.1

Divide each side by '1.2'.
x = -16.75

Simplifying
x = -16.75

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