(10y+(9-y))+9=(y+10(y-9))

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Solution for (10y+(9-y))+9=(y+10(y-9)) equation:


Simplifying
(10y + (9 + -1y)) + 9 = (y + 10(y + -9))

Remove parenthesis around (9 + -1y)
(10y + 9 + -1y) + 9 = (y + 10(y + -9))

Reorder the terms:
(9 + 10y + -1y) + 9 = (y + 10(y + -9))

Combine like terms: 10y + -1y = 9y
(9 + 9y) + 9 = (y + 10(y + -9))

Remove parenthesis around (9 + 9y)
9 + 9y + 9 = (y + 10(y + -9))

Reorder the terms:
9 + 9 + 9y = (y + 10(y + -9))

Combine like terms: 9 + 9 = 18
18 + 9y = (y + 10(y + -9))

Reorder the terms:
18 + 9y = (y + 10(-9 + y))
18 + 9y = (y + (-9 * 10 + y * 10))
18 + 9y = (y + (-90 + 10y))

Reorder the terms:
18 + 9y = (-90 + y + 10y)

Combine like terms: y + 10y = 11y
18 + 9y = (-90 + 11y)

Remove parenthesis around (-90 + 11y)
18 + 9y = -90 + 11y

Solving
18 + 9y = -90 + 11y

Solving for variable 'y'.

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

Add '-11y' to each side of the equation.
18 + 9y + -11y = -90 + 11y + -11y

Combine like terms: 9y + -11y = -2y
18 + -2y = -90 + 11y + -11y

Combine like terms: 11y + -11y = 0
18 + -2y = -90 + 0
18 + -2y = -90

Add '-18' to each side of the equation.
18 + -18 + -2y = -90 + -18

Combine like terms: 18 + -18 = 0
0 + -2y = -90 + -18
-2y = -90 + -18

Combine like terms: -90 + -18 = -108
-2y = -108

Divide each side by '-2'.
y = 54

Simplifying
y = 54

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