21=7(y-11)

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Solution for 21=7(y-11) equation:


Simplifying
21 = 7(y + -11)

Reorder the terms:
21 = 7(-11 + y)
21 = (-11 * 7 + y * 7)
21 = (-77 + 7y)

Solving
21 = -77 + 7y

Solving for variable 'y'.

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

Add '-7y' to each side of the equation.
21 + -7y = -77 + 7y + -7y

Combine like terms: 7y + -7y = 0
21 + -7y = -77 + 0
21 + -7y = -77

Add '-21' to each side of the equation.
21 + -21 + -7y = -77 + -21

Combine like terms: 21 + -21 = 0
0 + -7y = -77 + -21
-7y = -77 + -21

Combine like terms: -77 + -21 = -98
-7y = -98

Divide each side by '-7'.
y = 14

Simplifying
y = 14

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