21=2y-9

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Solution for 21=2y-9 equation:


Simplifying
21 = 2y + -9

Reorder the terms:
21 = -9 + 2y

Solving
21 = -9 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
21 + -2y = -9 + 2y + -2y

Combine like terms: 2y + -2y = 0
21 + -2y = -9 + 0
21 + -2y = -9

Add '-21' to each side of the equation.
21 + -21 + -2y = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -2y = -9 + -21
-2y = -9 + -21

Combine like terms: -9 + -21 = -30
-2y = -30

Divide each side by '-2'.
y = 15

Simplifying
y = 15

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