4y-9=y+15

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


Simplifying
4y + -9 = y + 15

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

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

Solving
-9 + 4y = 15 + 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 + 4y + -1y = 15 + y + -1y

Combine like terms: 4y + -1y = 3y
-9 + 3y = 15 + y + -1y

Combine like terms: y + -1y = 0
-9 + 3y = 15 + 0
-9 + 3y = 15

Add '9' to each side of the equation.
-9 + 9 + 3y = 15 + 9

Combine like terms: -9 + 9 = 0
0 + 3y = 15 + 9
3y = 15 + 9

Combine like terms: 15 + 9 = 24
3y = 24

Divide each side by '3'.
y = 8

Simplifying
y = 8

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