.4x+3=-9

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Solution for .4x+3=-9 equation: 


Simplifying
0.4x + 3 = -9

Reorder the terms:
3 + 0.4x = -9

Solving
3 + 0.4x = -9

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 0.4x = -9 + -3

Combine like terms: 3 + -3 = 0
0 + 0.4x = -9 + -3
0.4x = -9 + -3

Combine like terms: -9 + -3 = -12
0.4x = -12

Divide each side by '0.4'.
x = -30

Simplifying
x = -30

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