3y-21=4+8y

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Solution for 3y-21=4+8y equation:


Simplifying
3y + -21 = 4 + 8y

Reorder the terms:
-21 + 3y = 4 + 8y

Solving
-21 + 3y = 4 + 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 + 3y + -8y = 4 + 8y + -8y

Combine like terms: 3y + -8y = -5y
-21 + -5y = 4 + 8y + -8y

Combine like terms: 8y + -8y = 0
-21 + -5y = 4 + 0
-21 + -5y = 4

Add '21' to each side of the equation.
-21 + 21 + -5y = 4 + 21

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

Combine like terms: 4 + 21 = 25
-5y = 25

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

Simplifying
y = -5

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