32
15
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`1)3(x-7)+15=21`
`=>3x-21+15=21`
`=>3x=21+21-15`
`=>3x=27`
`=>x=27:3`
`=>x=9`
Vậy `x=9`
_________________________
`2)(420-x)+108=-32`
`=>420-x+108=-32`
`=>-x=-32-108-420`
`=>-x=-496`
`=>x=496`
Vậy `x=496`
_________________________
`3)5/7-2x=-5/2`
`=>-2x=-5/2-5/7`
`=>-2x=-45/14`
`=>x=-45/14 : -2`
`=>x=45/28`
Vậy `x=45/28`
_________________________
`4)7(2/x-5)=1-5/6`
`=>14/x-35=1/6`
`=>14/x=1/6+35`
`=>14/x=211/6`
`=>14.6=211x`
`=>84=211x`
`=>x=211/84`
Vậy `x=211/84`
___________________________
`5)(6/3+x):2/3+4=7`
`=>(2+x):2/3=7-4`
`=>(2+x):2/3=3`
`=>2+x=3xx2/3`
`=>2+x=2`
`=>x=2-2`
`=>x=0`
Vậy `x=0`
_________________________________
`6)(x-3)/2=1/5`
`=>5(x-3)=2`
`=>5x-15=2`
`=>5x=2+15`
`=>5x=17`
`=>x=17/5`
Vậy `x=17/5`
_____________________________
`7)(x+8)/9=2/5`
`=>5(x+8)=2xx9`
`=>5x+40=18`
`=>5x=18-40`
`=>5x=-22`
`=>x=-22/5`
Vậy `x=-22/5`
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