-21=9+5(y-4)

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Solution for -21=9+5(y-4) equation:


Simplifying
-21 = 9 + 5(y + -4)

Reorder the terms:
-21 = 9 + 5(-4 + y)
-21 = 9 + (-4 * 5 + y * 5)
-21 = 9 + (-20 + 5y)

Combine like terms: 9 + -20 = -11
-21 = -11 + 5y

Solving
-21 = -11 + 5y

Solving for variable 'y'.

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

Add '-5y' to each side of the equation.
-21 + -5y = -11 + 5y + -5y

Combine like terms: 5y + -5y = 0
-21 + -5y = -11 + 0
-21 + -5y = -11

Add '21' to each side of the equation.
-21 + 21 + -5y = -11 + 21

Combine like terms: -21 + 21 = 0
0 + -5y = -11 + 21
-5y = -11 + 21

Combine like terms: -11 + 21 = 10
-5y = 10

Divide each side by '-5'.
y = -2

Simplifying
y = -2

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