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√x=√x-5 +1
(√x)²=(√x-5 + 1)²
x=(√x-5)²+2(√x-5)+1
x=x-5+2√x-5+1
x=x+2√x-5 - 4
4=2√x-5
2=√x-5
4=x-5
9=x
Rpta: 9