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Simplifying
6r2 + -150 = 0
Reorder the terms:
-150 + 6r2 = 0
Solving
-150 + 6r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '150' to each side of the equation.
-150 + 150 + 6r2 = 0 + 150
Combine like terms: -150 + 150 = 0
0 + 6r2 = 0 + 150
6r2 = 0 + 150
Combine like terms: 0 + 150 = 150
6r2 = 150
Divide each side by '6'.
r2 = 25
Simplifying
r2 = 25
Take the square root of each side:
r = {-5, 5}
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