3[y-4]=21

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Solution for 3[y-4]=21 equation: 


Simplifying
3[y + -4] = 21

Reorder the terms:
3[-4 + y] = 21
[-4 * 3 + y * 3] = 21
[-12 + 3y] = 21

Solving
-12 + 3y = 21

Solving for variable 'y'.

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

Add '12' to each side of the equation.
-12 + 12 + 3y = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 3y = 21 + 12
3y = 21 + 12

Combine like terms: 21 + 12 = 33
3y = 33

Divide each side by '3'.
y = 11

Simplifying
y = 11

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