3(4)-y=9

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Solution for 3(4)-y=9 equation: 


Simplifying
3(4) + -1y = 9

Multiply 3 * 4
12 + -1y = 9

Solving
12 + -1y = 9

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 + -1y = 9 + -12

Combine like terms: 12 + -12 = 0
0 + -1y = 9 + -12
-1y = 9 + -12

Combine like terms: 9 + -12 = -3
-1y = -3

Divide each side by '-1'.
y = 3

Simplifying
y = 3

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