Răspuns :
39(2x-3)=15(3x+1)
78x-117=45x+15
78x-45=15+117
33x=132
x=132/33
x=4
78x-117=45x+15
78x-45=15+117
33x=132
x=132/33
x=4
DVA:X apartine lui R\{-1/3}
78X-117=45X=15 <=>33X=132<=>X=132/33=4<=>X=4
78X-117=45X=15 <=>33X=132<=>X=132/33=4<=>X=4