21=3(y+2)-6y

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Solution for 21=3(y+2)-6y equation:


Simplifying
21 = 3(y + 2) + -6y

Reorder the terms:
21 = 3(2 + y) + -6y
21 = (2 * 3 + y * 3) + -6y
21 = (6 + 3y) + -6y

Combine like terms: 3y + -6y = -3y
21 = 6 + -3y

Solving
21 = 6 + -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 = 6 + -3y + 3y

Combine like terms: -3y + 3y = 0
21 + 3y = 6 + 0
21 + 3y = 6

Add '-21' to each side of the equation.
21 + -21 + 3y = 6 + -21

Combine like terms: 21 + -21 = 0
0 + 3y = 6 + -21
3y = 6 + -21

Combine like terms: 6 + -21 = -15
3y = -15

Divide each side by '3'.
y = -5

Simplifying
y = -5

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