21=-4+2(y-8)

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Solution for 21=-4+2(y-8) equation:


Simplifying
21 = -4 + 2(y + -8)

Reorder the terms:
21 = -4 + 2(-8 + y)
21 = -4 + (-8 * 2 + y * 2)
21 = -4 + (-16 + 2y)

Combine like terms: -4 + -16 = -20
21 = -20 + 2y

Solving
21 = -20 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
21 + -2y = -20 + 2y + -2y

Combine like terms: 2y + -2y = 0
21 + -2y = -20 + 0
21 + -2y = -20

Add '-21' to each side of the equation.
21 + -21 + -2y = -20 + -21

Combine like terms: 21 + -21 = 0
0 + -2y = -20 + -21
-2y = -20 + -21

Combine like terms: -20 + -21 = -41
-2y = -41

Divide each side by '-2'.
y = 20.5

Simplifying
y = 20.5

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