0.8x-0.9=3.9

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Solution for 0.8x-0.9=3.9 equation: 


Simplifying
0.8x + -0.9 = 3.9

Reorder the terms:
-0.9 + 0.8x = 3.9

Solving
-0.9 + 0.8x = 3.9

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 + 0.8x = 3.9 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + 0.8x = 3.9 + 0.9
0.8x = 3.9 + 0.9

Combine like terms: 3.9 + 0.9 = 4.8
0.8x = 4.8

Divide each side by '0.8'.
x = 6

Simplifying
x = 6

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