Solving equation and proportion: x-1.75 = 2.8, x-3 / 5, x = 16 / 17, 12:5 = x:4

Solving equation and proportion: x-1.75 = 2.8, x-3 / 5, x = 16 / 17, 12:5 = x:4

X-1.75=2.8
x=2.8+1.75
x=4.55
X - 3 / 5 x = 16 / 17
2X / 5 = 16 / 17
X = 40 out of 17
12:5=x:4
5x=48
x=9.6