640=y*.8

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Solution for 640=y*.8 equation:


Simplifying
640 = y * 0.8

Reorder the terms for easier multiplication:
640 = 0.8y

Solving
640 = 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.
640 + -0.8y = 0.8y + -0.8y

Combine like terms: 0.8y + -0.8y = 0.0
640 + -0.8y = 0.0

Add '-640' to each side of the equation.
640 + -640 + -0.8y = 0.0 + -640

Combine like terms: 640 + -640 = 0
0 + -0.8y = 0.0 + -640
-0.8y = 0.0 + -640

Combine like terms: 0.0 + -640 = -640
-0.8y = -640

Divide each side by '-0.8'.
y = 800

Simplifying
y = 800

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