4*(3.2+0.4y)+4y=-4

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Solution for 4*(3.2+0.4y)+4y=-4 equation: 


Simplifying
4(3.2 + 0.4y) + 4y = -4
(3.2 * 4 + 0.4y * 4) + 4y = -4
(12.8 + 1.6y) + 4y = -4

Combine like terms: 1.6y + 4y = 5.6y
12.8 + 5.6y = -4

Solving
12.8 + 5.6y = -4

Solving for variable 'y'.

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

Add '-12.8' to each side of the equation.
12.8 + -12.8 + 5.6y = -4 + -12.8

Combine like terms: 12.8 + -12.8 = 0.0
0.0 + 5.6y = -4 + -12.8
5.6y = -4 + -12.8

Combine like terms: -4 + -12.8 = -16.8
5.6y = -16.8

Divide each side by '5.6'.
y = -3

Simplifying
y = -3

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