Đáp án:
`S={-11/4}.`
Giải thích các bước giải:
`(3x-4)(2x+1)-(6x+5)(x+3)=3`
`<=>6x^2+3x-8x-4-(6x^2+18x+5x+15)=3`
`<=>6x^2-5x-4-(6x^2+23x+15)=3`
`<=>-28x-19=3`
`<=>-28x=22`
`<=>x=-11/4`.
Vậy `S={-11/4}.`
`6x^2 - 8x + 3x - 4 - (6x^2 + 5x + 18x + 15) = 3`
`6x^2 - 5x - 4 - (6x^2 + 23x + 15) = 3`
`6x^2 - 5x - 4 - 6x^2 - 23x - 15 = 3`
`-28x - 19 = 3`
`-28x = 22`
`x = -11/14`
Vậy `x = -11/14`
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