Răspunsuri

2014-05-28T14:57:50+03:00
7(3x-4)+19=3(5x-7)
21x-28+19=15x-21
21x-15x=-21-19+28
6x=30
x=30 supra 6
x=5
6(5-3x)=20-5(4+3x)
30-18x=20-20+15x
-18x-15x=20-20-30
-33=-30    / (-1)
33=30
x=33 pe 30
x=1,1