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por ello supongamos x=√7 así:
a) -2x+5x-8x+3x-5x+7x
=-15x+15x=0
y=√2
b)1/3y-2y+7y-1/6y
=2/6y-1/6y+5y
=1/6y+5y
=(1+30)/6y
=31/6y =31/6 √2
z=√11 w=√17
c) 5z-3w-4z-9z+8w
= -8z+5w
=-8√11+5√17