(y-9)+y=90

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Solution for (y-9)+y=90 equation:


Simplifying
(y + -9) + y = 90

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

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

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

Solving
-9 + 2y = 90

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + 2y = 90 + 9

Combine like terms: -9 + 9 = 0
0 + 2y = 90 + 9
2y = 90 + 9

Combine like terms: 90 + 9 = 99
2y = 99

Divide each side by '2'.
y = 49.5

Simplifying
y = 49.5

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