30-1200÷X=6
1200/x=24
x=1200/24
x=50
3000÷60×50-X=20
250-x=20
x=250-20
x=230
80÷5-X÷3=5
x/3=16-5
x/3=11
x=33
X÷120-X÷150=5 两边乘500
5x-4x=3000
x=30003000÷60×50-X=20250-x=20x=250-20x=230这错了X÷120-X÷150=5 两边乘500 5x-4x=3000x=3000 过程写清楚！X÷120-X÷150=5 两边乘600 5x-4x=3000x=3000