400=9y-5-9(5y-9)

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Solution for 400=9y-5-9(5y-9) equation:


Simplifying
400 = 9y + -5 + -9(5y + -9)

Reorder the terms:
400 = 9y + -5 + -9(-9 + 5y)
400 = 9y + -5 + (-9 * -9 + 5y * -9)
400 = 9y + -5 + (81 + -45y)

Reorder the terms:
400 = -5 + 81 + 9y + -45y

Combine like terms: -5 + 81 = 76
400 = 76 + 9y + -45y

Combine like terms: 9y + -45y = -36y
400 = 76 + -36y

Solving
400 = 76 + -36y

Solving for variable 'y'.

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

Add '36y' to each side of the equation.
400 + 36y = 76 + -36y + 36y

Combine like terms: -36y + 36y = 0
400 + 36y = 76 + 0
400 + 36y = 76

Add '-400' to each side of the equation.
400 + -400 + 36y = 76 + -400

Combine like terms: 400 + -400 = 0
0 + 36y = 76 + -400
36y = 76 + -400

Combine like terms: 76 + -400 = -324
36y = -324

Divide each side by '36'.
y = -9

Simplifying
y = -9

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