0.42x-0.3(0.4x-3)=0

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Solution for 0.42x-0.3(0.4x-3)=0 equation: 


Simplifying
0.42x + -0.3(0.4x + -3) = 0

Reorder the terms:
0.42x + -0.3(-3 + 0.4x) = 0
0.42x + (-3 * -0.3 + 0.4x * -0.3) = 0
0.42x + (0.9 + -0.12x) = 0

Reorder the terms:
0.9 + 0.42x + -0.12x = 0

Combine like terms: 0.42x + -0.12x = 0.3x
0.9 + 0.3x = 0

Solving
0.9 + 0.3x = 0

Solving for variable 'x'.

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

Add '-0.9' to each side of the equation.
0.9 + -0.9 + 0.3x = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + 0.3x = 0 + -0.9
0.3x = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
0.3x = -0.9

Divide each side by '0.3'.
x = -3

Simplifying
x = -3

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