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5+2(2x+1)=5(x-1)
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Răspuns :

5+4x+2=5x-5
4x+2=5x
(grupăm termenii)
5x-4x=2
x=2
5+4x+2=5x-5
7+4x=5x-5
7+5= - 4x+5x
x = 12