[5y-4]=21

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Solution for [5y-4]=21 equation: 


Simplifying
[5y + -4] = 21

Reorder the terms:
[-4 + 5y] = 21

Remove brackets around [-4 + 5y]
-4 + 5y = 21

Solving
-4 + 5y = 21

Solving for variable 'y'.

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

Add '4' to each side of the equation.
-4 + 4 + 5y = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5y = 21 + 4
5y = 21 + 4

Combine like terms: 21 + 4 = 25
5y = 25

Divide each side by '5'.
y = 5

Simplifying
y = 5

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