3[y-9]=6

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Solution for 3[y-9]=6 equation: 


Simplifying
3[y + -9] = 6

Reorder the terms:
3[-9 + y] = 6
[-9 * 3 + y * 3] = 6
[-27 + 3y] = 6

Solving
-27 + 3y = 6

Solving for variable 'y'.

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

Add '27' to each side of the equation.
-27 + 27 + 3y = 6 + 27

Combine like terms: -27 + 27 = 0
0 + 3y = 6 + 27
3y = 6 + 27

Combine like terms: 6 + 27 = 33
3y = 33

Divide each side by '3'.
y = 11

Simplifying
y = 11

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