3=-x-.4y

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Solution for 3=-x-.4y equation: 


Simplifying
3 = -1x + -0.4y

Solving
3 = -1x + -0.4y

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
3 + x = -1x + x + -0.4y

Combine like terms: -1x + x = 0
3 + x = 0 + -0.4y
3 + x = -0.4y

Add '-3' to each side of the equation.
3 + -3 + x = -3 + -0.4y

Combine like terms: 3 + -3 = 0
0 + x = -3 + -0.4y
x = -3 + -0.4y

Simplifying
x = -3 + -0.4y

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