412:4+ {19 + 2x[216-5x(axb+1)]}x10=2013
103+ { 19 + 2x[216-5x(axb+1)]}x10=2013|-103
{19+2x[216-5x(axb+1)]}x10=1910|:10
19+2x[216-5x(axb+1)]=191|-19
2x[216-5x(axb+1)]=172|:2
216-5x(axb+1)=86=>5x(axb+1)=216-86
5x(axb+1)=130|:5
axb+1=26|-1
axb=25
=> a =1,b=25 ; a=5 , b=5
Spor la lucru !
