3.1x-3.9=8.5

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Solution for 3.1x-3.9=8.5 equation: 


Simplifying
3.1x + -3.9 = 8.5

Reorder the terms:
-3.9 + 3.1x = 8.5

Solving
-3.9 + 3.1x = 8.5

Solving for variable 'x'.

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

Add '3.9' to each side of the equation.
-3.9 + 3.9 + 3.1x = 8.5 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + 3.1x = 8.5 + 3.9
3.1x = 8.5 + 3.9

Combine like terms: 8.5 + 3.9 = 12.4
3.1x = 12.4

Divide each side by '3.1'.
x = 4

Simplifying
x = 4

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