9-2y=8y-21

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Solution for 9-2y=8y-21 equation:


Simplifying
9 + -2y = 8y + -21

Reorder the terms:
9 + -2y = -21 + 8y

Solving
9 + -2y = -21 + 8y

Solving for variable 'y'.

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

Add '-8y' to each side of the equation.
9 + -2y + -8y = -21 + 8y + -8y

Combine like terms: -2y + -8y = -10y
9 + -10y = -21 + 8y + -8y

Combine like terms: 8y + -8y = 0
9 + -10y = -21 + 0
9 + -10y = -21

Add '-9' to each side of the equation.
9 + -9 + -10y = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -10y = -21 + -9
-10y = -21 + -9

Combine like terms: -21 + -9 = -30
-10y = -30

Divide each side by '-10'.
y = 3

Simplifying
y = 3

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