12y-9=4y+15

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Solution for 12y-9=4y+15 equation:


Simplifying
12y + -9 = 4y + 15

Reorder the terms:
-9 + 12y = 4y + 15

Reorder the terms:
-9 + 12y = 15 + 4y

Solving
-9 + 12y = 15 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
-9 + 12y + -4y = 15 + 4y + -4y

Combine like terms: 12y + -4y = 8y
-9 + 8y = 15 + 4y + -4y

Combine like terms: 4y + -4y = 0
-9 + 8y = 15 + 0
-9 + 8y = 15

Add '9' to each side of the equation.
-9 + 9 + 8y = 15 + 9

Combine like terms: -9 + 9 = 0
0 + 8y = 15 + 9
8y = 15 + 9

Combine like terms: 15 + 9 = 24
8y = 24

Divide each side by '8'.
y = 3

Simplifying
y = 3

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