.4+x=-3

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Solution for .4+x=-3 equation: 


Simplifying
0.4 + x = -3

Solving
0.4 + x = -3

Solving for variable 'x'.

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

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

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + x = -3 + -0.4
x = -3 + -0.4

Combine like terms: -3 + -0.4 = -3.4
x = -3.4

Simplifying
x = -3.4

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