7(3y-3)=21

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Solution for 7(3y-3)=21 equation: 


Simplifying
7(3y + -3) = 21

Reorder the terms:
7(-3 + 3y) = 21
(-3 * 7 + 3y * 7) = 21
(-21 + 21y) = 21

Solving
-21 + 21y = 21

Solving for variable 'y'.

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

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

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

Combine like terms: 21 + 21 = 42
21y = 42

Divide each side by '21'.
y = 2

Simplifying
y = 2

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