3y-21=-9(y+5)

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Solution for 3y-21=-9(y+5) equation:


Simplifying
3y + -21 = -9(y + 5)

Reorder the terms:
-21 + 3y = -9(y + 5)

Reorder the terms:
-21 + 3y = -9(5 + y)
-21 + 3y = (5 * -9 + y * -9)
-21 + 3y = (-45 + -9y)

Solving
-21 + 3y = -45 + -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 = -45 + -9y + 9y

Combine like terms: 3y + 9y = 12y
-21 + 12y = -45 + -9y + 9y

Combine like terms: -9y + 9y = 0
-21 + 12y = -45 + 0
-21 + 12y = -45

Add '21' to each side of the equation.
-21 + 21 + 12y = -45 + 21

Combine like terms: -21 + 21 = 0
0 + 12y = -45 + 21
12y = -45 + 21

Combine like terms: -45 + 21 = -24
12y = -24

Divide each side by '12'.
y = -2

Simplifying
y = -2

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