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2014-11-06T14:02:13+02:00
(x:11-4):3-55=4
(x:11-4):3=59 
x:11-4=177
x:11=181
x=1991

x=1  (1-1)(1+3)=0  0x4=0
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2014-11-06T14:03:47+02:00
(X:11-4):3-55=4
(x:11-4)=4+55
(x:11-4):3=59
x:11-4=59*3
x:11-4=177
x:11=177+4
x:11=181
x=181*11=1991
Verificare(1991:11-4):3-55=(181-4):3-55=177:3-55=59-55=4

(x-1)(x+3)=0

x-1=0 ⇒ x=1
x+3=0⇒ x=-3
x∈{-3;1}

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