3(-0.8+0.4y)+2y=0

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Solution for 3(-0.8+0.4y)+2y=0 equation: 


Simplifying
3(-0.8 + 0.4y) + 2y = 0
(-0.8 * 3 + 0.4y * 3) + 2y = 0
(-2.4 + 1.2y) + 2y = 0

Combine like terms: 1.2y + 2y = 3.2y
-2.4 + 3.2y = 0

Solving
-2.4 + 3.2y = 0

Solving for variable 'y'.

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

Add '2.4' to each side of the equation.
-2.4 + 2.4 + 3.2y = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 3.2y = 0 + 2.4
3.2y = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
3.2y = 2.4

Divide each side by '3.2'.
y = 0.75

Simplifying
y = 0.75

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