12-y=42

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Solution for 12-y=42 equation:


12-y=42

We simplify the equation to the form, which is simple to understand 
12-y=42

We move all terms containing y to the left and all other terms to the right. 
-1y=+42-12

We simplify left and right side of the equation. 
-1y=+30

We divide both sides of the equation by -1 to get y. 
y=-30

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