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√x+1=-2x+8
(√x+1)²=(-2x+8)²
x+1=4x²-32x+64
0=4x²-32x-x+64-1
4x²-33x-63=0
(4x-21)(x-3)=0
4x-21=0 x-3=0
x=21/4 x=3
solucion: x=3