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Solving implies you are talking about an equation. Equations must have equal marks in them somewhere. If you mean y + 12 = -8

then subtract 8 from both sides of the equation ( or if your teacher is really strict you will be told to add -12 to both sides of the equation, but the same thing happens)

y + 12 - 12 = -8 - 12, then on the left and right simplify to

y = -20

This is called the subtraction property of equality (if you subtract 12) or the addition property of equality (if you add -12)

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Q: Which property would you use to solve y 12 -8?
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