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Simplifying
5y2 = 81
Solving
5y2 = 81
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Divide each side by '5'.
y2 = 16.2
Simplifying
y2 = 16.2
Take the square root of each side:
y = {-4.02492236, 4.02492236}
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