0.4(-70+-90y)-0.4y=4

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Solution for 0.4(-70+-90y)-0.4y=4 equation: 


Simplifying
0.4(-70 + -90y) + -0.4y = 4
(-70 * 0.4 + -90y * 0.4) + -0.4y = 4
(-28 + -36y) + -0.4y = 4

Combine like terms: -36y + -0.4y = -36.4y
-28 + -36.4y = 4

Solving
-28 + -36.4y = 4

Solving for variable 'y'.

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

Add '28' to each side of the equation.
-28 + 28 + -36.4y = 4 + 28

Combine like terms: -28 + 28 = 0
0 + -36.4y = 4 + 28
-36.4y = 4 + 28

Combine like terms: 4 + 28 = 32
-36.4y = 32

Divide each side by '-36.4'.
y = -0.8791208791

Simplifying
y = -0.8791208791

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