1: x=-13/52+8/52=-5/52
2: x/3=14/21-3/21=11/21
=>x=11/7
3: =>-5/6-x=7/12-4/12=3/12=1/4
=>x+5/6=-1/4
=>x=-1/4-5/6=-13/12
4: =>x-21/5=-2/3
=>x=-2/3+21/5=-10/15+63/15=53/15
Đúng 3
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1: x=-13/52+8/52=-5/52
2: x/3=14/21-3/21=11/21
=>x=11/7
3: =>-5/6-x=7/12-4/12=3/12=1/4
=>x+5/6=-1/4
=>x=-1/4-5/6=-13/12
4: =>x-21/5=-2/3
=>x=-2/3+21/5=-10/15+63/15=53/15
Đúng 2
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