7(y-4)=21

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Solution for 7(y-4)=21 equation: 


Simplifying
7(y + -4) = 21

Reorder the terms:
7(-4 + y) = 21
(-4 * 7 + y * 7) = 21
(-28 + 7y) = 21

Solving
-28 + 7y = 21

Solving for variable 'y'.

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

Add '28' to each side of the equation.
-28 + 28 + 7y = 21 + 28

Combine like terms: -28 + 28 = 0
0 + 7y = 21 + 28
7y = 21 + 28

Combine like terms: 21 + 28 = 49
7y = 49

Divide each side by '7'.
y = 7

Simplifying
y = 7

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