1) =13-4х+3,4+4х-6=10,4; 2) = 9-8у+х-7х-4у = 9 - 12у - 6х;
3) = -17х+4-15-3х-3 =-20х-14; 4) =-6х-0,5х+26-5х-12 = -11,5х+14;
5) = 2,1-5,1х-4-4,6х+14 = -9,7х+12,1; 6) = -9х-3у-12у+14х-1= 4+5х-15у;
7) =8+4,5х+44-х+6=3,5х+58; 8)= 9х-18+3х-7х-4 = 5х-22:
9) = -7х-1,4-5-5-3х-4 = -10х-5,4; 10) = -6х+5х-3+9х-1,2 = 8х-4,2;
11) -6,6-1,7х+4-9,6х-4 = 11,3х-6,6; 12) 15-6,1х-у-2-у-3х = 13-9,1х-2у;
13) = 1-4х-14+4х-6 = -19; 14)= 9-8у-2х-7х-4у= -9х-12у+9;
15) = -17х+4-14-3х-3= -20х-13; 16) =-6х-0,5х+3-9х+12 = -15,5х+15;
17) 2,6-5,2х-4-9,8х-14 = -15х-11,4; 19) -7х+14-5х+3х-10 = -9х+4;
20) -6х+3,5х-3+х+12 = 1,5х+9