1. 3n-8n-5n+2+2n -3(a-2)+6(a-4)-4(3a+2) 5/12(4,8p-4 4/5k)-4,5(4/9p-0,4k) 2. решить уравнение 0,4(а-4)-0,3(а-3)=1,7

2.

 0.4(а - 4) - 0.3(а - 3) =1.7

 0.4а - 1.6 - 0.3а + 0.9 =1.7

 0.1а - 0.7 = 1.7

 0.1а = 1.7+ 0.7

 0.1а=2.4

 а = 2.4 / 0.1

 a = 24