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rezolvati va rog ecuatia:5(7-2X)=15(X-1)

Răspuns :

5(7-2x)=15(x-1) 35-10x=15x-15 35+15=15x+10x 50=25x X=50:25 X=2
35-10x=15x-15
-10x-15x=-15-35
-25x=-50
x=-50:(-25)=+2