8y-21=15+4y

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Solution for 8y-21=15+4y equation:


Simplifying
8y + -21 = 15 + 4y

Reorder the terms:
-21 + 8y = 15 + 4y

Solving
-21 + 8y = 15 + 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 + 8y + -4y = 15 + 4y + -4y

Combine like terms: 8y + -4y = 4y
-21 + 4y = 15 + 4y + -4y

Combine like terms: 4y + -4y = 0
-21 + 4y = 15 + 0
-21 + 4y = 15

Add '21' to each side of the equation.
-21 + 21 + 4y = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 4y = 15 + 21
4y = 15 + 21

Combine like terms: 15 + 21 = 36
4y = 36

Divide each side by '4'.
y = 9

Simplifying
y = 9

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