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x in (-oo:+oo)
(x+7)^2 = 49/16 // - 49/16
(x+7)^2-(49/16) = 0
(x+7)^2-49/16 = 0
(16*(x+7)^2)/16-49/16 = 0
16*(x+7)^2-49 = 0
16*x^2+224*x+735 = 0
16*x^2+224*x+735 = 0
16*x^2+224*x+735 = 0
DELTA = 224^2-(4*16*735)
DELTA = 3136
DELTA > 0
x = (3136^(1/2)-224)/(2*16) or x = (-3136^(1/2)-224)/(2*16)
x = -21/4 or x = -35/4
(x+35/4)*(x+21/4) = 0
((x+35/4)*(x+21/4))/16 = 0
((x+35/4)*(x+21/4))/16 = 0 // * 16
(x+35/4)*(x+21/4) = 0
( x+21/4 )
x+21/4 = 0 // - 21/4
x = -21/4
( x+35/4 )
x+35/4 = 0 // - 35/4
x = -35/4
x in { -21/4, -35/4 }
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