-3y-21=-9(y+1)

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Solution for -3y-21=-9(y+1) equation:


Simplifying
-3y + -21 = -9(y + 1)

Reorder the terms:
-21 + -3y = -9(y + 1)

Reorder the terms:
-21 + -3y = -9(1 + y)
-21 + -3y = (1 * -9 + y * -9)
-21 + -3y = (-9 + -9y)

Solving
-21 + -3y = -9 + -9y

Solving for variable 'y'.

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

Add '9y' to each side of the equation.
-21 + -3y + 9y = -9 + -9y + 9y

Combine like terms: -3y + 9y = 6y
-21 + 6y = -9 + -9y + 9y

Combine like terms: -9y + 9y = 0
-21 + 6y = -9 + 0
-21 + 6y = -9

Add '21' to each side of the equation.
-21 + 21 + 6y = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 6y = -9 + 21
6y = -9 + 21

Combine like terms: -9 + 21 = 12
6y = 12

Divide each side by '6'.
y = 2

Simplifying
y = 2

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