-9y-21=-4(y+9)

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Solution for -9y-21=-4(y+9) equation:


Simplifying
-9y + -21 = -4(y + 9)

Reorder the terms:
-21 + -9y = -4(y + 9)

Reorder the terms:
-21 + -9y = -4(9 + y)
-21 + -9y = (9 * -4 + y * -4)
-21 + -9y = (-36 + -4y)

Solving
-21 + -9y = -36 + -4y

Solving for variable 'y'.

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

Add '4y' to each side of the equation.
-21 + -9y + 4y = -36 + -4y + 4y

Combine like terms: -9y + 4y = -5y
-21 + -5y = -36 + -4y + 4y

Combine like terms: -4y + 4y = 0
-21 + -5y = -36 + 0
-21 + -5y = -36

Add '21' to each side of the equation.
-21 + 21 + -5y = -36 + 21

Combine like terms: -21 + 21 = 0
0 + -5y = -36 + 21
-5y = -36 + 21

Combine like terms: -36 + 21 = -15
-5y = -15

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

Simplifying
y = 3

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