3*4-9y=21

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


Simplifying
3 * 4 + -9y = 21

Multiply 3 * 4
12 + -9y = 21

Solving
12 + -9y = 21

Solving for variable 'y'.

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

Add '-12' to each side of the equation.
12 + -12 + -9y = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -9y = 21 + -12
-9y = 21 + -12

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

Divide each side by '-9'.
y = -1

Simplifying
y = -1

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