0.4(0.1x+0.3)=-.8

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Solution for 0.4(0.1x+0.3)=-.8 equation: 


Simplifying
0.4(0.1x + 0.3) = -0.8

Reorder the terms:
0.4(0.3 + 0.1x) = -0.8
(0.3 * 0.4 + 0.1x * 0.4) = -0.8
(0.12 + 0.04x) = -0.8

Solving
0.12 + 0.04x = -0.8

Solving for variable 'x'.

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

Add '-0.12' to each side of the equation.
0.12 + -0.12 + 0.04x = -0.8 + -0.12

Combine like terms: 0.12 + -0.12 = 0.00
0.00 + 0.04x = -0.8 + -0.12
0.04x = -0.8 + -0.12

Combine like terms: -0.8 + -0.12 = -0.92
0.04x = -0.92

Divide each side by '0.04'.
x = -23

Simplifying
x = -23

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