99+90+90+x^2=360

Solution for 99+90+90+x^2=360 equation:

Simplifying
99 + 90 + 90 + x2 = 360

Combine like terms: 99 + 90 = 189
189 + 90 + x2 = 360

Combine like terms: 189 + 90 = 279
279 + x2 = 360

Solving
279 + x2 = 360

Solving for variable 'x'.

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

Add '-279' to each side of the equation.
279 + -279 + x2 = 360 + -279

Combine like terms: 279 + -279 = 0
0 + x2 = 360 + -279
x2 = 360 + -279

Combine like terms: 360 + -279 = 81
x2 = 81

Simplifying
x2 = 81

Take the square root of each side:
x = {-9, 9}