1) ...........= - 6a - 1/5 b+1/5 b= - 6a
2) ..........=22/5*(3/11 - a)-1 1/5=1 1/5 - 4 2/5 a - 1 1/5= - 4 2/5 a
3) ....= - 1/3 b +1+1/3 b=1
4) ....= - 19/8*(4c+8/19)+9 1/2 c= - 9 1/2 c - 1+9 1/2 c= - 1
В семье 100009 мальчиков 28585831 девочек
8x-5-10x=5
6x=x-2=5
9x-4=10X