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`bb{(8x + 2)(1 - 3x) + ( 6x - 1 )(4x - 10) = -50}`
`bb{<=>8x-24x^2+2-6x + 24x^2-60x-4x+10 = -50}`
`bb{<=>(-24x^2+ 24x^2)+(8x-6x-60x-4x)+2 +10 = -50}`
`bb{<=>-62x+12 = -50}`
`bb{<=>50+12 = 62x}`
`bb{<=>62x=62}`
`bb{<=>x=1}`
Vậy `bb{x=1`