-21=-3(y+6)

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Solution for -21=-3(y+6) equation:


Simplifying
-21 = -3(y + 6)

Reorder the terms:
-21 = -3(6 + y)
-21 = (6 * -3 + y * -3)
-21 = (-18 + -3y)

Solving
-21 = -18 + -3y

Solving for variable 'y'.

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

Add '3y' to each side of the equation.
-21 + 3y = -18 + -3y + 3y

Combine like terms: -3y + 3y = 0
-21 + 3y = -18 + 0
-21 + 3y = -18

Add '21' to each side of the equation.
-21 + 21 + 3y = -18 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = -18 + 21
3y = -18 + 21

Combine like terms: -18 + 21 = 3
3y = 3

Divide each side by '3'.
y = 1

Simplifying
y = 1

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