0.3x+0.9=0.8x-2.1

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Solution for 0.3x+0.9=0.8x-2.1 equation: 


Simplifying
0.3x + 0.9 = 0.8x + -2.1

Reorder the terms:
0.9 + 0.3x = 0.8x + -2.1

Reorder the terms:
0.9 + 0.3x = -2.1 + 0.8x

Solving
0.9 + 0.3x = -2.1 + 0.8x

Solving for variable 'x'.

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

Add '-0.8x' to each side of the equation.
0.9 + 0.3x + -0.8x = -2.1 + 0.8x + -0.8x

Combine like terms: 0.3x + -0.8x = -0.5x
0.9 + -0.5x = -2.1 + 0.8x + -0.8x

Combine like terms: 0.8x + -0.8x = 0.0
0.9 + -0.5x = -2.1 + 0.0
0.9 + -0.5x = -2.1

Add '-0.9' to each side of the equation.
0.9 + -0.9 + -0.5x = -2.1 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + -0.5x = -2.1 + -0.9
-0.5x = -2.1 + -0.9

Combine like terms: -2.1 + -0.9 = -3
-0.5x = -3

Divide each side by '-0.5'.
x = 6

Simplifying
x = 6

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