4 1/4*(x-3)=8 1/2*0,2
4 1/4x-12 3/4=1 7/10
4 1/4x=1 7/10+12 3/4
4 1/4x=1 14/20+12 15/20
4 1/4x=13 29/20
x=13 29/20:4 1/4
x=289/20*4/17
x=17/5
x=3 2/5
этот же
4,25*(x-3)=8,5*0,2
4,25x-12,75=1,7
4,25x=1,7+12,75
4,25x=14,45
x=14,45:4,25
x=3,4
======================
55/81*(x+5)=1 5/9*3 1/7
55/81x+275/81=14/9*22/7
55/81x+275/81=44/9
55/81x=44/9-275/81
55/81x=396/81-275/81
55/81x=121/81
x=121/81*81/55
x=121/55
x=2 1/5