4/77 - 2/69
(x+1)(x+2)(x+3)(x+4)-48
3000 ÷ 12000
3000 divided by 12000
3044/19
(x+1)
3044
5×4+3-2/2
solve equations: x/2+x/3+x/4=1
solve equations: x/3-x/4=1
