21=54-8(2-y)

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Solution for 21=54-8(2-y) equation: 


Simplifying
21 = 54 + -8(2 + -1y)
21 = 54 + (2 * -8 + -1y * -8)
21 = 54 + (-16 + 8y)

Combine like terms: 54 + -16 = 38
21 = 38 + 8y

Solving
21 = 38 + 8y

Solving for variable 'y'.

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

Add '-8y' to each side of the equation.
21 + -8y = 38 + 8y + -8y

Combine like terms: 8y + -8y = 0
21 + -8y = 38 + 0
21 + -8y = 38

Add '-21' to each side of the equation.
21 + -21 + -8y = 38 + -21

Combine like terms: 21 + -21 = 0
0 + -8y = 38 + -21
-8y = 38 + -21

Combine like terms: 38 + -21 = 17
-8y = 17

Divide each side by '-8'.
y = -2.125

Simplifying
y = -2.125

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