9+9=y

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Solution for 9+9=y equation: 


Simplifying
9 + 9 = y

Combine like terms: 9 + 9 = 18
18 = y

Solving
18 = y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
18 + -1y = y + -1y

Combine like terms: y + -1y = 0
18 + -1y = 0

Add '-18' to each side of the equation.
18 + -18 + -1y = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -1y = 0 + -18
-1y = 0 + -18

Combine like terms: 0 + -18 = -18
-1y = -18

Divide each side by '-1'.
y = 18

Simplifying
y = 18

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