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Simplifying
9b2 = 15
Solving
9b2 = 15
Solving for variable 'b'.
Move all terms containing b to the left, all other terms to the right.
Divide each side by '9'.
b2 = 1.666666667
Simplifying
b2 = 1.666666667
Take the square root of each side:
b = {-1.290994449, 1.290994449}
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