-21=7(y+3)

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


Simplifying
-21 = 7(y + 3)

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

Solving
-21 = 21 + 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 = 21 + 7y + -7y

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

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

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

Combine like terms: 21 + 21 = 42
-7y = 42

Divide each side by '-7'.
y = -6

Simplifying
y = -6

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