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15x\sqrt{45}-85=0
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 15x.
15x\times 3\sqrt{5}-85=0
Factor 45=3^{2}\times 5. Rewrite the square root of the product \sqrt{3^{2}\times 5} as the product of square roots \sqrt{3^{2}}\sqrt{5}. Take the square root of 3^{2}.
45x\sqrt{5}-85=0
Multiply 15 and 3 to get 45.
45x\sqrt{5}=85
Add 85 to both sides. Anything plus zero gives itself.
45\sqrt{5}x=85
The equation is in standard form.
\frac{45\sqrt{5}x}{45\sqrt{5}}=\frac{85}{45\sqrt{5}}
Divide both sides by 45\sqrt{5}.
x=\frac{85}{45\sqrt{5}}
Dividing by 45\sqrt{5} undoes the multiplication by 45\sqrt{5}.
x=\frac{17\sqrt{5}}{45}
Divide 85 by 45\sqrt{5}.