3.9=2.1-0.4y

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Solution for 3.9=2.1-0.4y equation: 


Simplifying
3.9 = 2.1 + -0.4y

Solving
3.9 = 2.1 + -0.4y

Solving for variable 'y'.

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

Add '0.4y' to each side of the equation.
3.9 + 0.4y = 2.1 + -0.4y + 0.4y

Combine like terms: -0.4y + 0.4y = 0.0
3.9 + 0.4y = 2.1 + 0.0
3.9 + 0.4y = 2.1

Add '-3.9' to each side of the equation.
3.9 + -3.9 + 0.4y = 2.1 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + 0.4y = 2.1 + -3.9
0.4y = 2.1 + -3.9

Combine like terms: 2.1 + -3.9 = -1.8
0.4y = -1.8

Divide each side by '0.4'.
y = -4.5

Simplifying
y = -4.5

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