@bosveryaaaaaaaa The diagram is misleading but it’s not unsolvable. The remaining angle in the square is 360-3*80=120°. Opposite angle is also 120°. Angle opposite x is 0.5*(180-120)=30°. x=180-30=150°.
@onlyskypace It’s nothing else but 9. Factorizing gives x(x-9)=0, letting you think 0 is one solution but that value is excluded from the beginning by the definition of the equation where there is a division by x.
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