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Simplifying
3 = 12 + -1y2
Solving
3 = 12 + -1y2
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add 'y2' to each side of the equation.
3 + y2 = 12 + -1y2 + y2
Combine like terms: -1y2 + y2 = 0
3 + y2 = 12 + 0
3 + y2 = 12
Add '-3' to each side of the equation.
3 + -3 + y2 = 12 + -3
Combine like terms: 3 + -3 = 0
0 + y2 = 12 + -3
y2 = 12 + -3
Combine like terms: 12 + -3 = 9
y2 = 9
Simplifying
y2 = 9
Take the square root of each side:
y = {-3, 3}
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