3=-y-15

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Solution for 3=-y-15 equation: 


Simplifying
3 = -1y + -15

Reorder the terms:
3 = -15 + -1y

Solving
3 = -15 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
3 + y = -15 + -1y + y

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

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

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

Combine like terms: -15 + -3 = -18
y = -18

Simplifying
y = -18

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