Question

х-4 ÷(разделить) 3х + 1 = 3

Answer 1

(х-4)/(3х+1)=3    (О.Д.З. - x не равно -1/3)
x-4=9x+3
8x=-7
x=-7/8

Answer 2

x-4   = 3
3x+1

(3x+1)*3=x-4
9x+3=x-4
8x=-7
x=-7/8