9-21=3y-4y

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Solution for 9-21=3y-4y equation:


Simplifying
9 + -21 = 3y + -4y

Combine like terms: 9 + -21 = -12
-12 = 3y + -4y

Combine like terms: 3y + -4y = -1y
-12 = -1y

Solving
-12 = -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.
-12 + y = -1y + y

Combine like terms: -1y + y = 0
-12 + y = 0

Add '12' to each side of the equation.
-12 + 12 + y = 0 + 12

Combine like terms: -12 + 12 = 0
0 + y = 0 + 12
y = 0 + 12

Combine like terms: 0 + 12 = 12
y = 12

Simplifying
y = 12

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