12y-9=18+3y

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Solution for 12y-9=18+3y equation:


Simplifying
12y + -9 = 18 + 3y

Reorder the terms:
-9 + 12y = 18 + 3y

Solving
-9 + 12y = 18 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
-9 + 12y + -3y = 18 + 3y + -3y

Combine like terms: 12y + -3y = 9y
-9 + 9y = 18 + 3y + -3y

Combine like terms: 3y + -3y = 0
-9 + 9y = 18 + 0
-9 + 9y = 18

Add '9' to each side of the equation.
-9 + 9 + 9y = 18 + 9

Combine like terms: -9 + 9 = 0
0 + 9y = 18 + 9
9y = 18 + 9

Combine like terms: 18 + 9 = 27
9y = 27

Divide each side by '9'.
y = 3

Simplifying
y = 3

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