664.5=-100y

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Solution for 664.5=-100y equation:


Simplifying
664.5 = -100y

Solving
664.5 = -100y

Solving for variable 'y'.

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

Add '100y' to each side of the equation.
664.5 + 100y = -100y + 100y

Combine like terms: -100y + 100y = 0
664.5 + 100y = 0

Add '-664.5' to each side of the equation.
664.5 + -664.5 + 100y = 0 + -664.5

Combine like terms: 664.5 + -664.5 = 0.0
0.0 + 100y = 0 + -664.5
100y = 0 + -664.5

Combine like terms: 0 + -664.5 = -664.5
100y = -664.5

Divide each side by '100'.
y = -6.645

Simplifying
y = -6.645

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