0=90-x^2

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Solution for 0=90-x^2 equation: 


Simplifying
0 = 90 + -1x2

Solving
0 = 90 + -1x2

Solving for variable 'x'.

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

Add 'x2' to each side of the equation.
0 + x2 = 90 + -1x2 + x2
Remove the zero:
x2 = 90 + -1x2 + x2

Combine like terms: -1x2 + x2 = 0
x2 = 90 + 0
x2 = 90

Simplifying
x2 = 90

Take the square root of each side:
x = {-9.486832981, 9.486832981}

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