heyboy 7х-18х+25х-6х=-11х+19х=8х
11а-16b-18a+9b=-7a-7b

-4a+12a+13a-27a=8a-14a=-6a
-17x+19y-15y+13x=-4x+4y

3(5a+4)-11a=15a+12-11a=4a12
3a(7-b)-(b-3a)=21a-3ab-b+3a=21a-b
(3x-11)•0,2-5(4-3x)=0,6x-2,2-20+1,5x=15,6x-22,2
-35(3a-2b)+2(13a-b)=-105a+70b+26a-2b=-79a+68b

-4x-8(9-2x)=-4x-72+16x=12x-72
6(3x-2)+4(5x-1)=18x-12+20x-4=38x-16
-6(8a-2b)+(3a-7b)•(-0,2)=-48a+12b-0,6a+1,4b=-48,6a+13,4b
4(8t+7)-16(2t-3)=32t+28-32t+48=28+48=76

8y+5y-9y-7y+8=13y-16y+8=-3y+8 , при у=-18
-3•(-18)+8=54+8=62