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(x+6)(x-6) = 0
x+6 = 0 x-6 = 0
x= -6 x = 6
CS = (-6;6)
x +4x
x +4x
4x+4x = 8x
(x+4)(x+4) = 0
x+4 = 0 x+4 = 0
x = -4 x = -4
CS = (-4)