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calculati |2x-4|=8 va rooooog


Răspuns :

primul caz:
2x-4=8
2x=12
x=6
al doilea caz:
-(2x-4)=8
-2x+4=8
-2x=4
x=-2
rezulta x apartine {6,-2}
2x-4=8
2x=8+4
2x=12
x=6

2x-4=-8
2x=-8+4
2x=-4
x=-2