3.4x=2.1x+3.9

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Solution for 3.4x=2.1x+3.9 equation: 


Simplifying
3.4x = 2.1x + 3.9

Reorder the terms:
3.4x = 3.9 + 2.1x

Solving
3.4x = 3.9 + 2.1x

Solving for variable 'x'.

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

Add '-2.1x' to each side of the equation.
3.4x + -2.1x = 3.9 + 2.1x + -2.1x

Combine like terms: 3.4x + -2.1x = 1.3x
1.3x = 3.9 + 2.1x + -2.1x

Combine like terms: 2.1x + -2.1x = 0.0
1.3x = 3.9 + 0.0
1.3x = 3.9

Divide each side by '1.3'.
x = 3

Simplifying
x = 3

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