[tex] \left \{ {{x+4=35} \atop {2(x-6)= y+7}} \right. <=> \left \{ {{x=35-y} \atop {2x-y=19}} \right. <=> \left \{ {{x=35-y} \atop {2(35-y)-y=19}} \right. <=> \left \{ {{x=35-y} \atop {70-2y-y=19}} \right. [/tex][tex]<=> \left \{ {{x=35-y} \atop {-3y=19-70}} \right. <=> \left \{ {{x-35-4} \atop {-3y=-51}} \right. <=> \left \{ {{x=18} \atop {y=17}} \right. [/tex]
x - fete
y - baieti
