0.4(0.1x+0.7)=-0.4

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Solution for 0.4(0.1x+0.7)=-0.4 equation: 


Simplifying
0.4(0.1x + 0.7) = -0.4

Reorder the terms:
0.4(0.7 + 0.1x) = -0.4
(0.7 * 0.4 + 0.1x * 0.4) = -0.4
(0.28 + 0.04x) = -0.4

Solving
0.28 + 0.04x = -0.4

Solving for variable 'x'.

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

Add '-0.28' to each side of the equation.
0.28 + -0.28 + 0.04x = -0.4 + -0.28

Combine like terms: 0.28 + -0.28 = 0.00
0.00 + 0.04x = -0.4 + -0.28
0.04x = -0.4 + -0.28

Combine like terms: -0.4 + -0.28 = -0.68
0.04x = -0.68

Divide each side by '0.04'.
x = -17

Simplifying
x = -17

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