Решите уравнения: x + 3,1 / 4/15 : 2/5 + 1/3 = 7

X+3.1/ 4/15:2/5+1/3=7
x+3.1*3.75:2/5+1/3=7
x+3.1*3.75:2/5=7-1/3
x+3.1*3.75:2/5=6 2/3
x+3.1*3.75=6 2\3*2/5
x+3.1*3.75=2 2/3
x+11.625=2 2/3
x=11.625-2 2/3
x=11 5/8-2 2/3
x=11 15/24-2 16/24
x=8 23/24