3,75÷10 4/10=3 11/13÷4x
3,75:10 4/10=3 11/13:4x 4x*3,75=10 4/10*3 11/13 10 4/10*3 11/13=104/10*50/13=40 4х*3,75=40 4х=40:3,75 40:3 75/100=40:3 3/4=40:15/4=40*4/15=32/3 4х=32/3 x=32/3:4 32/3:4=32/3*1/4=8/3=2 2/3 x=2 2/3