0.3x+2.1=0.2x-0.4

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Solution for 0.3x+2.1=0.2x-0.4 equation: 


Simplifying
0.3x + 2.1 = 0.2x + -0.4

Reorder the terms:
2.1 + 0.3x = 0.2x + -0.4

Reorder the terms:
2.1 + 0.3x = -0.4 + 0.2x

Solving
2.1 + 0.3x = -0.4 + 0.2x

Solving for variable 'x'.

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

Add '-0.2x' to each side of the equation.
2.1 + 0.3x + -0.2x = -0.4 + 0.2x + -0.2x

Combine like terms: 0.3x + -0.2x = 0.1x
2.1 + 0.1x = -0.4 + 0.2x + -0.2x

Combine like terms: 0.2x + -0.2x = 0.0
2.1 + 0.1x = -0.4 + 0.0
2.1 + 0.1x = -0.4

Add '-2.1' to each side of the equation.
2.1 + -2.1 + 0.1x = -0.4 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + 0.1x = -0.4 + -2.1
0.1x = -0.4 + -2.1

Combine like terms: -0.4 + -2.1 = -2.5
0.1x = -2.5

Divide each side by '0.1'.
x = -25

Simplifying
x = -25

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