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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-49+784 = 0
16*X^2+224*X-49+784 = 0
16*X^2+224*X-49+784 = 0
DELTA = 224^2-(4*16*(784-49))
DELTA = 50176-64*(784-49)
DELTA = 3136
DELTA > 0
X = ((50176-64*(784-49))^(1/2)-224)/(2*16) or X = (-(50176-64*(784-49))^(1/2)-224)/(2*16)
X = (56-224)/32 or X = (-224-56)/32
(X-((-224-56)/32))*(X-((56-224)/32)) = 0
((X-((-224-56)/32))*(X-((56-224)/32)))/16 = 0
((X-((-224-56)/32))*(X-((56-224)/32)))/16 = 0 // * 16
(X-((-224-56)/32))*(X-((56-224)/32)) = 0
( X-((-224-56)/32) )
X-((-224-56)/32) = 0 // + (-224-56)/32
X = (-224-56)/32
( X-((56-224)/32) )
X-((56-224)/32) = 0 // + (56-224)/32
X = (56-224)/32
X in { (-224-56)/32, (56-224)/32 }
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