6x^2+9x^2=z^2

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Solution for 6x^2+9x^2=z^2 equation: 


Simplifying
6x2 + 9x2 = z2

Combine like terms: 6x2 + 9x2 = 15x2
15x2 = z2

Solving
15x2 = z2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '15'.
x2 = 0.06666666667z2

Simplifying
x2 = 0.06666666667z2

Take the square root of each side:
x = {-0.25819889z, 0.25819889z}

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