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Simplifying
3y2 + 9 = 90
Reorder the terms:
9 + 3y2 = 90
Solving
9 + 3y2 = 90
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 = 90 + -9
Combine like terms: 9 + -9 = 0
0 + 3y2 = 90 + -9
3y2 = 90 + -9
Combine like terms: 90 + -9 = 81
3y2 = 81
Divide each side by '3'.
y2 = 27
Simplifying
y2 = 27
Take the square root of each side:
y = {-5.196152423, 5.196152423}
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