\(=6x^2+12x-4x-8-\left(9x^2-30x+25\right)+8x\left(7x+3\right)\)
\(=6x^2+8x-8+56x^2+24x-9x^2+30x-25\)
\(=53x^2+62x-33\)
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\(=6x^2+12x-4x-8-\left(9x^2-30x+25\right)+8x\left(7x+3\right)\)
\(=6x^2+8x-8+56x^2+24x-9x^2+30x-25\)
\(=53x^2+62x-33\)