15=3y-6y

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Solution for 15=3y-6y equation:


Simplifying
15 = 3y + -6y

Combine like terms: 3y + -6y = -3y
15 = -3y

Solving
15 = -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.
15 + 3y = -3y + 3y

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

Add '-15' to each side of the equation.
15 + -15 + 3y = 0 + -15

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

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

Divide each side by '3'.
y = -5

Simplifying
y = -5

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