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Sagot :

22)
7x=3/11+1/4
7x=23/44
x=23/308

23)
x-21=4x-6+3
x-21=4x-3
x-4x=-3+21
x=-6

25)
4x+27=-10x+90
4x+10x=90-27
14x=63
x=9/2

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