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³√²⁷/₈+9x-(1-⁹₄)²=13⁷₁₆
3/2+9x-1-81/16=13i7/16
9x=13i7/16-3/2+1+5i1/16
9x=19i8/16-1i8/16
9x=18
x=2
Odp. Szukany x wynosi 2