3(1-2х)-5(3-х)-6(3х-4)=83
3-6х-15+5х-18х+24=83
-6х+5х-18х=83-3+15-24
-19х=71
х=- 71/19
3-6x-15+5x-18x+24=83
-6x+5x-18x=83-24-3+15
-19x=71
x=-3.14\19
1)1-100x=0. , -100х=-1, 100х=1, х= 1/100, х =0,01
2)8c+0,73=4,61-8c. , 8с+8с=4,61-0,73, 16с=3,88, с = 3,88 / 16, с = 0,2425
3)(8x+11)-13=9x-5, 8х-9х=-5-11+13 -х=-3, х =3