0.4x+0.8=0.9x-1.2

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Solution for 0.4x+0.8=0.9x-1.2 equation: 


Simplifying
0.4x + 0.8 = 0.9x + -1.2

Reorder the terms:
0.8 + 0.4x = 0.9x + -1.2

Reorder the terms:
0.8 + 0.4x = -1.2 + 0.9x

Solving
0.8 + 0.4x = -1.2 + 0.9x

Solving for variable 'x'.

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

Add '-0.9x' to each side of the equation.
0.8 + 0.4x + -0.9x = -1.2 + 0.9x + -0.9x

Combine like terms: 0.4x + -0.9x = -0.5x
0.8 + -0.5x = -1.2 + 0.9x + -0.9x

Combine like terms: 0.9x + -0.9x = 0.0
0.8 + -0.5x = -1.2 + 0.0
0.8 + -0.5x = -1.2

Add '-0.8' to each side of the equation.
0.8 + -0.8 + -0.5x = -1.2 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -0.5x = -1.2 + -0.8
-0.5x = -1.2 + -0.8

Combine like terms: -1.2 + -0.8 = -2
-0.5x = -2

Divide each side by '-0.5'.
x = 4

Simplifying
x = 4

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