21-4y=9-2y

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Solution for 21-4y=9-2y equation:


Simplifying
21 + -4y = 9 + -2y

Solving
21 + -4y = 9 + -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
21 + -4y + 2y = 9 + -2y + 2y

Combine like terms: -4y + 2y = -2y
21 + -2y = 9 + -2y + 2y

Combine like terms: -2y + 2y = 0
21 + -2y = 9 + 0
21 + -2y = 9

Add '-21' to each side of the equation.
21 + -21 + -2y = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -2y = 9 + -21
-2y = 9 + -21

Combine like terms: 9 + -21 = -12
-2y = -12

Divide each side by '-2'.
y = 6

Simplifying
y = 6

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