1/7(1+3x)+2-1/6=1-15/6x
(1+3x)/7+2-1/6=1-15/6x
Amplificam fractia (1+3x)/7 cu 6, pe 2 cu 42, pe 1/6 cu 7, pe 1 cu 6x
6(1+3x) supra 42 +84/42-7/42=(6x-15)/6x
(6+18x+84-7)/42=(6x-15)/6x
(83+18x)/42=(6x-15)/6x
(83+18x)×6x=42×(6x-15) |:6
(83+18x)×x=7×(6x-15)
83x+18x^2=42x-105
83x+18x^2-42x=-105
41x+18x^2=-105
