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Simplifying
3y2 + -9 = 9
Reorder the terms:
-9 + 3y2 = 9
Solving
-9 + 3y2 = 9
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '9' to each side of the equation.
-9 + 9 + 3y2 = 9 + 9
Combine like terms: -9 + 9 = 0
0 + 3y2 = 9 + 9
3y2 = 9 + 9
Combine like terms: 9 + 9 = 18
3y2 = 18
Divide each side by '3'.
y2 = 6
Simplifying
y2 = 6
Take the square root of each side:
y = {-2.449489743, 2.449489743}
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