15=3(y-3)+y

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Solution for 15=3(y-3)+y equation: 


Simplifying
15 = 3(y + -3) + y

Reorder the terms:
15 = 3(-3 + y) + y
15 = (-3 * 3 + y * 3) + y
15 = (-9 + 3y) + y

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

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

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

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

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

Combine like terms: -9 + -15 = -24
-4y = -24

Divide each side by '-4'.
y = 6

Simplifying
y = 6

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