9+y+y=1

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Solution for 9+y+y=1 equation: 


Simplifying
9 + y + y = 1

Combine like terms: y + y = 2y
9 + 2y = 1

Solving
9 + 2y = 1

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 = 1 + -9

Combine like terms: 9 + -9 = 0
0 + 2y = 1 + -9
2y = 1 + -9

Combine like terms: 1 + -9 = -8
2y = -8

Divide each side by '2'.
y = -4

Simplifying
y = -4

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