0.4y+0.9=0.4-0.1y

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Solution for 0.4y+0.9=0.4-0.1y equation: 


Simplifying
0.4y + 0.9 = 0.4 + -0.1y

Reorder the terms:
0.9 + 0.4y = 0.4 + -0.1y

Solving
0.9 + 0.4y = 0.4 + -0.1y

Solving for variable 'y'.

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

Add '0.1y' to each side of the equation.
0.9 + 0.4y + 0.1y = 0.4 + -0.1y + 0.1y

Combine like terms: 0.4y + 0.1y = 0.5y
0.9 + 0.5y = 0.4 + -0.1y + 0.1y

Combine like terms: -0.1y + 0.1y = 0.0
0.9 + 0.5y = 0.4 + 0.0
0.9 + 0.5y = 0.4

Add '-0.9' to each side of the equation.
0.9 + -0.9 + 0.5y = 0.4 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + 0.5y = 0.4 + -0.9
0.5y = 0.4 + -0.9

Combine like terms: 0.4 + -0.9 = -0.5
0.5y = -0.5

Divide each side by '0.5'.
y = -1

Simplifying
y = -1

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