a) -20*(x-13)=-220
-20x+260=-220
-20x=-480
x=24
б) (30-7х)*8=352
240-56x=352
-56x=112
x=-2
г) (2,8-0,1х)*3,7=7,4
10.36-0.37x=7.4
-0.37x=-2.96
x=8
д) (3х-1,2)*7=10,5
21x-8.4=10.5
21x=18.9
x=0.9
е) 1/3х+5/6х-1=1 1/3
1/3x+5/6x-1=4/3
2/6x+5/6x=4/3+3/3
7/6x=7/3
x=2
a) -20*(x-13)=-220
-20x+260=-220
-20x=-480
x=24
б) (30-7х)*8=352
240-56x=352
-56x=112
x=-2
г) (2,8-0,1х)*3,7=7,4
10.36-0.37x=7.4
-0.37x=-2.96
x=8
д) (3х-1,2)*7=10,5
21x-8.4=10.5
21x=18.9
x=0.9
е) 1/3х+5/6х-1=1 1/3
1/3x+5/6x-1=4/3
2/6x+5/6x=4/3+3/3
7/6x=7/3
x=2