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x³=200-75
x³=125
x=³√125
x=5
Rpta: 5
b) (x+2)²=81
x+2=√81
x+2=9
x=9-2
x=7
Rpta: 7
c) √x-3=6
x-3=6²
x-3=36
x=36+3
x=39
Rpta: 39