-3(y+9)=3y-21

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Solution for -3(y+9)=3y-21 equation: 


Simplifying
-3(y + 9) = 3y + -21

Reorder the terms:
-3(9 + y) = 3y + -21
(9 * -3 + y * -3) = 3y + -21
(-27 + -3y) = 3y + -21

Reorder the terms:
-27 + -3y = -21 + 3y

Solving
-27 + -3y = -21 + 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.
-27 + -3y + -3y = -21 + 3y + -3y

Combine like terms: -3y + -3y = -6y
-27 + -6y = -21 + 3y + -3y

Combine like terms: 3y + -3y = 0
-27 + -6y = -21 + 0
-27 + -6y = -21

Add '27' to each side of the equation.
-27 + 27 + -6y = -21 + 27

Combine like terms: -27 + 27 = 0
0 + -6y = -21 + 27
-6y = -21 + 27

Combine like terms: -21 + 27 = 6
-6y = 6

Divide each side by '-6'.
y = -1

Simplifying
y = -1

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