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x1 = - 1
x2 = 1 i 1/4
b)
x = 1/2
c)
x = -5
d)
x=1
e)
x=2
f)
x=3
g)
x= -2
h)
x= -7
x1 = -1
x2 = 1
j)
x1 = -7
x2 = -2