8y-21=2y-9

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


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

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

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

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

Combine like terms: 8y + -2y = 6y
-21 + 6y = -9 + 2y + -2y

Combine like terms: 2y + -2y = 0
-21 + 6y = -9 + 0
-21 + 6y = -9

Add '21' to each side of the equation.
-21 + 21 + 6y = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 6y = -9 + 21
6y = -9 + 21

Combine like terms: -9 + 21 = 12
6y = 12

Divide each side by '6'.
y = 2

Simplifying
y = 2

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