y=0.8y+420

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Solution for y=0.8y+420 equation: 


Simplifying
y = 0.8y + 420

Reorder the terms:
y = 420 + 0.8y

Solving
y = 420 + 0.8y

Solving for variable 'y'.

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

Add '-0.8y' to each side of the equation.
y + -0.8y = 420 + 0.8y + -0.8y

Combine like terms: y + -0.8y = 0.2y
0.2y = 420 + 0.8y + -0.8y

Combine like terms: 0.8y + -0.8y = 0.0
0.2y = 420 + 0.0
0.2y = 420

Divide each side by '0.2'.
y = 2100

Simplifying
y = 2100

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