4.2x-4.5=3.9

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Solution for 4.2x-4.5=3.9 equation: 


Simplifying
4.2x + -4.5 = 3.9

Reorder the terms:
-4.5 + 4.2x = 3.9

Solving
-4.5 + 4.2x = 3.9

Solving for variable 'x'.

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

Add '4.5' to each side of the equation.
-4.5 + 4.5 + 4.2x = 3.9 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 4.2x = 3.9 + 4.5
4.2x = 3.9 + 4.5

Combine like terms: 3.9 + 4.5 = 8.4
4.2x = 8.4

Divide each side by '4.2'.
x = 2

Simplifying
x = 2

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