4y+21=9y

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Solution for 4y+21=9y equation:


Simplifying
4y + 21 = 9y

Reorder the terms:
21 + 4y = 9y

Solving
21 + 4y = 9y

Solving for variable 'y'.

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

Add '-9y' to each side of the equation.
21 + 4y + -9y = 9y + -9y

Combine like terms: 4y + -9y = -5y
21 + -5y = 9y + -9y

Combine like terms: 9y + -9y = 0
21 + -5y = 0

Add '-21' to each side of the equation.
21 + -21 + -5y = 0 + -21

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

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

Divide each side by '-5'.
y = 4.2

Simplifying
y = 4.2

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