eu til pot rezolva_
2{7*2x-2*1-3*4x+3*1}=3{5*3x+3*2-1}-19x+13
2{14x-2-12x+3}=3{15x+6-1}-19x+13
2*14x-2*2-2*12x+2*3=3*15x+3*6-3*1-19x+13
28x-4-24x+6=45x+18-3-19x+13
28x-24x-45x+19x=18-3+13+4-6
4x-45x+19x=15+13+4-6
-41x+19x=28+4-6
-22x=26
x=22supra 26 simplificam cu 2 si ne da 11 supra 13
