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rezolva ecuatia:12 inmultit(x-2)+15=39 urgent dau coroana!

Răspuns :

15+12(x-2)=39
12x-24+15=39
12x+(15-24)=39
12x-9=39
12x=9+39
12x=48
x=48/12
x=4
12*(x-2)+15=39
12x-24+15=39/-15
12x-24=24
12x=24+24
x=48/:12
x=4