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( -4x+15)-(-2x-4)=25 va rog frumos :(


Răspuns :

-4X+15+2X+4=25
-2X=25-19
-2X=6
X=-3

desfacem parantezele -4x+15+2x+4=25
calculam
-2x+19=25
-2x=25-19
-2x=6
x=-3