Giải phương trình chứa ẩn ở tử số.

`#Ly`

`[2x-((4-3x))/5]/15=((7x-(x-3)/2))/5-x+1`

`<=>[2x-((4-3x))/5]/15=(21x-(3x-9)/2)/15-(x-1)`

`<=>[2x-((4-3x))/5]/15=(21x-(3x-9)/2)/15-(15x-15)/15`

`=>2x-((4-3x))/5=21x-(3x-9)/2-15x+15`

`<=>(20x)/10-((8-6x))/10=(210x)/10-(15x-45)/10 - (150x)/10+150/10`

`=>20x-(8-6x)=210x-(15x-45)-150x+150`

`<=>20x-8+6x=210x-15x+45-150x+150`

`<=>20x+6x-210x+15x+150x=8+45+150`

`<=>-19x=203`

`<=>x=-203/19`

Vậy `S={-203/19}`