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1、3/4x-1/5=2/5
3/4x=2/5+1/5
3/4x=3/5
x=3/5÷3/4
x=3/5×4/3
x=4/5
2、x+5/6x=33
(1+5/6)x=33
11/6x=33
x=33÷11/6
x=33×6/11
x=18
3、x-1/4x=15
(1-1/4)x=15
3/4x=15
x=15÷3/4
x=15×4/3
x=20
4、x÷6/7=13/20÷13/14
x÷6/7=13/20×14/13
x÷6/7=14/20
x÷6/7=7/10
x=7/10×7/6
x=49/60
3/4x=2/5+1/5
3/4x=3/5
x=3/5÷3/4
x=3/5×4/3
x=4/5
2、x+5/6x=33
(1+5/6)x=33
11/6x=33
x=33÷11/6
x=33×6/11
x=18
3、x-1/4x=15
(1-1/4)x=15
3/4x=15
x=15÷3/4
x=15×4/3
x=20
4、x÷6/7=13/20÷13/14
x÷6/7=13/20×14/13
x÷6/7=14/20
x÷6/7=7/10
x=7/10×7/6
x=49/60
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