3-4y=21-y

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


Simplifying
3 + -4y = 21 + -1y

Solving
3 + -4y = 21 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
3 + -4y + y = 21 + -1y + y

Combine like terms: -4y + y = -3y
3 + -3y = 21 + -1y + y

Combine like terms: -1y + y = 0
3 + -3y = 21 + 0
3 + -3y = 21

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

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

Combine like terms: 21 + -3 = 18
-3y = 18

Divide each side by '-3'.
y = -6

Simplifying
y = -6

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