(y+8)9=21y

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Solution for (y+8)9=21y equation:


Simplifying
(y + 8) * 9 = 21y

Reorder the terms:
(8 + y) * 9 = 21y

Reorder the terms for easier multiplication:
9(8 + y) = 21y
(8 * 9 + y * 9) = 21y
(72 + 9y) = 21y

Solving
72 + 9y = 21y

Solving for variable 'y'.

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

Add '-21y' to each side of the equation.
72 + 9y + -21y = 21y + -21y

Combine like terms: 9y + -21y = -12y
72 + -12y = 21y + -21y

Combine like terms: 21y + -21y = 0
72 + -12y = 0

Add '-72' to each side of the equation.
72 + -72 + -12y = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -12y = 0 + -72
-12y = 0 + -72

Combine like terms: 0 + -72 = -72
-12y = -72

Divide each side by '-12'.
y = 6

Simplifying
y = 6

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