-3[y-1]=9

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Solution for -3[y-1]=9 equation: 


Simplifying
-3[y + -1] = 9

Reorder the terms:
-3[-1 + y] = 9
[-1 * -3 + y * -3] = 9
[3 + -3y] = 9

Solving
3 + -3y = 9

Solving for variable 'y'.

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

Add '-3' to each side of the equation.
3 + -3 + -3y = 9 + -3

Combine like terms: 3 + -3 = 0
0 + -3y = 9 + -3
-3y = 9 + -3

Combine like terms: 9 + -3 = 6
-3y = 6

Divide each side by '-3'.
y = -2

Simplifying
y = -2

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