y-9-4y=21

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Solution for y-9-4y=21 equation:


Simplifying
y + -9 + -4y = 21

Reorder the terms:
-9 + y + -4y = 21

Combine like terms: y + -4y = -3y
-9 + -3y = 21

Solving
-9 + -3y = 21

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + -3y = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -3y = 21 + 9
-3y = 21 + 9

Combine like terms: 21 + 9 = 30
-3y = 30

Divide each side by '-3'.
y = -10

Simplifying
y = -10

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