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Simplifying
-5y2 + 45 = 0
Reorder the terms:
45 + -5y2 = 0
Solving
45 + -5y2 = 0
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '-45' to each side of the equation.
45 + -45 + -5y2 = 0 + -45
Combine like terms: 45 + -45 = 0
0 + -5y2 = 0 + -45
-5y2 = 0 + -45
Combine like terms: 0 + -45 = -45
-5y2 = -45
Divide each side by '-5'.
y2 = 9
Simplifying
y2 = 9
Take the square root of each side:
y = {-3, 3}
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