3y-9=y+12

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


Simplifying
3y + -9 = y + 12

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

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

Solving
-9 + 3y = 12 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
-9 + 3y + -1y = 12 + y + -1y

Combine like terms: 3y + -1y = 2y
-9 + 2y = 12 + y + -1y

Combine like terms: y + -1y = 0
-9 + 2y = 12 + 0
-9 + 2y = 12

Add '9' to each side of the equation.
-9 + 9 + 2y = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 2y = 12 + 9
2y = 12 + 9

Combine like terms: 12 + 9 = 21
2y = 21

Divide each side by '2'.
y = 10.5

Simplifying
y = 10.5

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