8y-0.4=9y

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Solution for 8y-0.4=9y equation:


Simplifying
8y + -0.4 = 9y

Reorder the terms:
-0.4 + 8y = 9y

Solving
-0.4 + 8y = 9y

Solving for variable 'y'.

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

Add '-9y' to each side of the equation.
-0.4 + 8y + -9y = 9y + -9y

Combine like terms: 8y + -9y = -1y
-0.4 + -1y = 9y + -9y

Combine like terms: 9y + -9y = 0
-0.4 + -1y = 0

Add '0.4' to each side of the equation.
-0.4 + 0.4 + -1y = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1y = 0 + 0.4
-1y = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1y = 0.4

Divide each side by '-1'.
y = -0.4

Simplifying
y = -0.4

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